NRA National Rifle Association Certified Gunsmith — Questions and Answers

Question 1: What is the correct direction to run a cleaning patch through a rifle barrel?

From breech to muzzle, to avoid forcing debris into the action (Correct answer)
Alternating directions for best results
From muzzle to breech, following the direction of the bullet
Direction does not matter

Correct answer: From breech to muzzle, to avoid forcing debris into the action

Patches should always be pushed from breech to muzzle to prevent debris from being pushed back into the action and to exit the muzzle cleanly.

Question 2: When case hardening a small steel part using pack hardening, what material is typically used as the carbonizing compound?

Beeswax and turpentine
Charcoal or bone meal mixed with an energizer (Correct answer)
Motor oil
Borax and salt mixture

Correct answer: Charcoal or bone meal mixed with an energizer

Traditional pack hardening uses charcoal or bone meal mixed with an energizer such as barium carbonate to introduce carbon into the surface layer.

Question 3: A lever-action rifle has a bent or cracked lever. The safest repair approach for a structural lever component is to:

Straighten the lever cold using a hydraulic press and re-install
Pin a steel gusset to the outside of the lever with rivets
Weld and re-heat-treat the lever, then verify dimensions and function (Correct answer)
Anneal the lever with a torch, straighten, and re-install without further heat treatment

Correct answer: Weld and re-heat-treat the lever, then verify dimensions and function

Welding the crack and re-heat-treating to original hardness restores the structural integrity needed to handle the stresses of firing; straightening without heat treatment leaves the part potentially brittle.

Question 4: What is the term for the unburned or partially burned powder that exits the muzzle during firing?

Flash (Correct answer)
Fouling
Muzzle blast
Blowback

Correct answer: Flash

The visible flash at the muzzle includes burning and unburned propellant gases; a muzzle flash device or suppressor can reduce this phenomenon.

Question 5: What is the primary purpose of metalworking in gunsmithing?

To shape, modify, and restore metal components for proper function (Correct answer)
To create decorative engravings on firearms
To improve the aesthetic design of the firearm
To modify the appearance of the firearm only

Correct answer: To shape, modify, and restore metal components for proper function

The primary purpose of metalworking in gunsmithing is to precisely shape, modify, and restore the numerous metal components that comprise a firearm. This involves techniques like machining, filing, welding, and heat treating to ensure parts fit together correctly, function reliably, and meet safety standards. Metalworking is essential for repairs, custom builds, and fine-tuning mechanical actions to achieve optimal performance.

Question 6: What is the advantage of a skeletonized bolt handle on a precision bolt-action rifle?

It improves bolt sealing against moisture
It provides a mounting point for a bipod
It reduces overall rifle weight without sacrificing bolt manipulation surface area (Correct answer)
It increases bolt lift force

Correct answer: It reduces overall rifle weight without sacrificing bolt manipulation surface area

Skeletonizing the bolt handle removes material from non-structural areas, reducing weight while maintaining the ergonomic surface area needed for fast, positive bolt manipulation.

Question 7: Which method is used to identify high spots when fitting a bolt's locking lugs for full-contact engagement?

Use a feeler gauge between each lug and its seat
Coat the lugs with machinist's blue (Dykem) and close the bolt to reveal contact marks (Correct answer)
Fire proof loads and inspect primer for flattening
Measure lug width with a micrometer and compare to receiver dimensions

Correct answer: Coat the lugs with machinist's blue (Dykem) and close the bolt to reveal contact marks

Machinist's blue (Dykem) transfers off the lugs onto the receiver seats where contact occurs, clearly showing which areas are bearing and which need lapping.

Question 8: What is 'electroless nickel plating' and why is it used on firearms?

A nickel-phosphorus alloy deposited without electric current — valued for uniform coating, hardness, and corrosion resistance (Correct answer)
A spray-applied nickel paint — used for budget builds
A nickel salt bath similar to hot bluing — used for carbon steel only
A nickel coating applied using electrical current — used for high-gloss appearance only

Correct answer: A nickel-phosphorus alloy deposited without electric current — valued for uniform coating, hardness, and corrosion resistance

Electroless nickel uses a chemical reduction process (no electricity) to deposit a uniform nickel-phosphorus layer that is hard, corrosion-resistant, and compatible with complex shapes.

Question 9: What is the role of precision in metalworking for gunsmithing?

It reduces the overall cost of production
It ensures proper fitting of components for reliable firearm function (Correct answer)
It is needed for visual appeal only
It is irrelevant as long as the parts are assembled

Correct answer: It ensures proper fitting of components for reliable firearm function

Precision in gunsmithing metalworking is paramount because firearms are intricate mechanical systems where components must fit together with exact tolerances. This precise fitting ensures that all parts interact correctly, preventing malfunctions, enhancing safety, and guaranteeing the firearm operates reliably. Without precision, parts might bind, wear prematurely, or fail, compromising the firearm's function and potentially endangering the user.

Question 10: What does 'case hardening' refer to in the context of firearm parts and finishes?

A heat treatment process that hardens the outer surface of steel parts while leaving the core tough (Correct answer)
Coating the exterior of a case with chrome for appearance
Hardening the cartridge case to withstand pressure
A type of bluing using high heat only

Correct answer: A heat treatment process that hardens the outer surface of steel parts while leaving the core tough

Case hardening (carburizing or nitriding) diffuses carbon or nitrogen into the surface layer, making it hard and wear-resistant while the core remains ductile.

Question 11: What is the main advantage of a 'DuraCoat' finish compared to bluing?

DuraCoat is a hot-bluing variant with better corrosion resistance
DuraCoat is applied only to polymer frames
DuraCoat is cheaper than all other finishes
DuraCoat is a two-part spray-on finish that is highly resistant to solvents, corrosion, and abrasion and can be applied without a curing oven (Correct answer)

Correct answer: DuraCoat is a two-part spray-on finish that is highly resistant to solvents, corrosion, and abrasion and can be applied without a curing oven

DuraCoat is an air-cure two-part lacquer finish that offers excellent durability and corrosion resistance without requiring an oven, making it accessible for field application.

Question 12: Why are firearm repair technicians required to be licensed in some jurisdictions?

To reduce the cost of firearm repairs
To guarantee repairs will be completed quickly
To increase the number of firearm repairs done
To ensure technicians have the knowledge and skills to safely repair firearms (Correct answer)

Correct answer: To ensure technicians have the knowledge and skills to safely repair firearms

Requiring firearm repair technicians to be licensed in some jurisdictions serves to ensure a high standard of competence and safety. Licensing verifies that technicians possess the necessary knowledge, training, and skills to properly diagnose, repair, and test firearms. This protects both the public and the firearm owner by minimizing the risk of unsafe repairs or modifications.

Question 13: When installing an aftermarket extended slide stop lever on a 1911 pistol, what function must be verified after installation?

The mainspring housing retention
That the lever does not engage (lock the slide open) inadvertently during firing due to shooter contact (Correct answer)
The grip panel fit
Trigger reset distance

Correct answer: That the lever does not engage (lock the slide open) inadvertently during firing due to shooter contact

Extended slide stop levers can be inadvertently pressed by the shooter's thumb during firing, causing the slide to lock back mid-magazine; function testing with live-fire is essential.

Question 14: What is 'Tennifer' (also known as Melonite or QPQ) as used on Glock slides?

A type of Parkerizing with added polymer
A spray-on corrosion inhibitor
A ferritic nitrocarburizing salt-bath process that diffuses nitrogen and carbon into the steel surface (Correct answer)
An electroless nickel coating

Correct answer: A ferritic nitrocarburizing salt-bath process that diffuses nitrogen and carbon into the steel surface

Tennifer/Melonite/QPQ is a salt-bath nitrocarburizing process that creates an extremely hard, corrosion-resistant surface layer integral to the metal, not a coating on top.

Question 15: When turning a barrel tenon on a lathe, what is the critical measurement that must be achieved for proper headspace?

Taper of the barrel contour
Outside diameter of the muzzle
Overall barrel length
Length and diameter of the tenon that controls chamber-to-bolt-face distance (Correct answer)

Correct answer: Length and diameter of the tenon that controls chamber-to-bolt-face distance

The tenon length and shoulder position directly control headspace by determining how far the barrel seats into the receiver relative to the bolt face.

Question 16: What is 'rust bluing' and what makes it distinctive compared to hot bluing?

A faster version of hot bluing using rust inhibitors
A cold chemical process identical to cold bluing
A Parkerizing variant used on rusty surplus firearms
A slow process that deliberately induces and converts rust to a stable black oxide finish, producing exceptional depth and durability (Correct answer)

Correct answer: A slow process that deliberately induces and converts rust to a stable black oxide finish, producing exceptional depth and durability

Rust bluing repeatedly applies an oxidizing solution, allows rust to form, cards it off, and boils the part to convert the oxide — producing a deep, hard, beautiful finish.

Question 17: When applying Cerakote, what temperature is typically required to cure the coating?

1000°F — requires a kiln
600°F — same as heat-bluing
Approximately 250–300°F in a curing oven for 1–2 hours (Correct answer)
Room temperature — air cures in 24 hours

Correct answer: Approximately 250–300°F in a curing oven for 1–2 hours

Cerakote H-series coatings are cured in an oven at approximately 250–300°F, which polymerizes the coating for maximum hardness and adhesion.

Question 18: Which heat treatment process is used to relieve internal stresses in a steel part after machining without significantly changing its hardness?

Full annealing
Case hardening
Stress relieving (Correct answer)
Normalizing

Correct answer: Stress relieving

Stress relieving heats the part below the critical transformation temperature and slow-cools it, eliminating machining stresses without major changes to hardness or microstructure.

Question 19: How does woodworking contribute to firearm comfort and ergonomics?

It improves the firearm's firing speed
It customizes grips and stocks for better comfort and ergonomics (Correct answer)
It only improves the aesthetic value of the firearm
It reduces the overall weight of the firearm

Correct answer: It customizes grips and stocks for better comfort and ergonomics

Woodworking in gunsmithing is essential for customizing grips and stocks, which directly impacts firearm comfort and ergonomics. A custom-fitted stock or grip allows the shooter to achieve a natural and stable hold, reducing fatigue and improving control. This personalized fit enhances the shooter's ability to aim and manage recoil effectively, leading to better accuracy and a more enjoyable shooting experience.

Question 20: What surface preparation step is essential before applying any coating to a firearm, and why?

Heating the metal to 500°F — activates the substrate for coating
Polishing to a mirror finish — all coatings require a bright surface
Proper metal preparation including cleaning, degreasing, and surface profiling to ensure adhesion (Correct answer)
Applying a primer coat of Parkerizing — required under all other finishes

Correct answer: Proper metal preparation including cleaning, degreasing, and surface profiling to ensure adhesion

Thorough cleaning, degreasing, and appropriate surface texture (blasted, polished, or phosphated) ensure the finish bonds properly and performs as intended.

Question 21: What action should a gunsmith take if a firearm closes on the FIELD headspace gauge?

The firearm is safe to return to the customer
Replace the firing pin spring
Polish the chamber and recheck
The firearm should not be returned to service; it requires barrel or action work to correct excessive headspace (Correct answer)

Correct answer: The firearm should not be returned to service; it requires barrel or action work to correct excessive headspace

A FIELD gauge represents the maximum safe headspace limit; a firearm that closes on it has dangerously excessive headspace and must not be fired until corrected.

Question 22: When fitting a new extractor to a semi-automatic pistol, the gunsmith should verify correct tension by:

Polishing the extractor claw until the cartridge slides freely under it
Measuring extractor protrusion with a dial caliper and comparing to spec
Verifying that the extractor spring coil count matches the OEM part
Pressing a loaded cartridge rim under the extractor and confirming snap-in with firm resistance (Correct answer)

Correct answer: Pressing a loaded cartridge rim under the extractor and confirming snap-in with firm resistance

Proper extractor tension is confirmed when a cartridge snaps under the extractor with firm resistance and does not rattle or fall out when the pistol is tilted.

Question 23: What role does the barrel length play in firearm customization?

Shorter barrels are only used for aesthetic purposes
Longer barrels reduce accuracy but increase recoil
Barrel length does not affect accuracy or recoil
Longer barrels improve accuracy and velocity (Correct answer)

Correct answer: Longer barrels improve accuracy and velocity

Barrel length significantly impacts a firearm's performance, particularly in terms of accuracy and velocity. A longer barrel allows propellent gases more time to act on the projectile, resulting in higher muzzle velocity and greater kinetic energy. Additionally, a longer barrel typically provides a longer sight radius, which can contribute to improved aiming precision and overall accuracy for the shooter.

Question 24: When performing a safety inspection on a used bolt-action rifle, what should be checked regarding the trigger sear engagement?

That the sear is made of stainless steel
Whether the trigger shoe is the correct width
That the sear has adequate engagement depth to prevent accidental firing, especially when the safety is disengaged or the bolt is closed forcefully (Correct answer)
Whether the trigger pull is under 1 pound

Correct answer: That the sear has adequate engagement depth to prevent accidental firing, especially when the safety is disengaged or the bolt is closed forcefully

Insufficient sear engagement can allow the rifle to fire without a trigger pull, especially after rough handling — a critical safety concern requiring adjustment or repair.

Question 25: Why is customizing the trigger important for firearm performance?

It changes the firearm’s caliber
It makes the firearm lighter
It improves the trigger’s responsiveness and smoothness (Correct answer)
It increases the recoil reduction

Correct answer: It improves the trigger’s responsiveness and smoothness

Customizing a firearm's trigger is paramount for optimizing shooting performance and accuracy. A well-tuned trigger improves responsiveness and smoothness by reducing pull weight, eliminating creep, and providing a crisp break. This allows the shooter to maintain better aim and control during the shot, minimizing unintentional movement and significantly enhancing precision.

Question 26: Which solvent is most appropriate for degreasing metal parts before bluing or Parkerizing?

WD-40
Acetone, naphtha, or commercial degreaser leaving no residue (Correct answer)
Lacquer thinner only
Mineral spirits with light oil

Correct answer: Acetone, naphtha, or commercial degreaser leaving no residue

Complete degreasing using residue-free solvents is essential because any oil or grease contamination will cause bluing or Parkerizing to fail or spot.

Question 27: What is the first step in customizing a firearm?

Assessing the firearm’s existing features and determining goals (Correct answer)
Replacing the barrel with a custom one
Polishing the firearm's exterior
Disassembling the firearm completely

Correct answer: Assessing the firearm’s existing features and determining goals

The first critical step in customizing a firearm is a thorough assessment of its existing features and a clear determination of the owner's goals. This initial evaluation helps the gunsmith understand the firearm's current capabilities, identify potential limitations, and define the desired improvements or modifications. Establishing clear objectives ensures that the customization process is purposeful, effective, and tailored to the user's specific needs.

Question 28: A semi-automatic rifle exhibits case head separations after minimal use. Which headspace gauge should the gunsmith use FIRST during diagnosis?

Minimum gauge
Go gauge
No-go gauge
Field gauge (Correct answer)

Correct answer: Field gauge

Case head separations indicate excessive headspace; using the field gauge first confirms whether headspace exceeds the maximum allowable limit.

Question 29: What is the purpose of a 'barrel vise' in gunsmithing?

To measure barrel straightness
To securely hold the barrel during barrel removal, installation, or threading operations without damaging the finish (Correct answer)
To hold the barrel while painting
To clamp the barrel to a workbench for cleaning

Correct answer: To securely hold the barrel during barrel removal, installation, or threading operations without damaging the finish

A barrel vise grips the barrel shank securely and without marring while the gunsmith applies torque to remove or install a barrel, or while threading.

Question 30: What is the recommended way to clean a suppressor (if the design permits)?

Soak in water for 24 hours
Soak in an ultrasonic cleaner with appropriate solvent or wet tumble in appropriate media (Correct answer)
Clean with bore brushes through each baffle
Use a high-pressure air hose to blow out debris

Correct answer: Soak in an ultrasonic cleaner with appropriate solvent or wet tumble in appropriate media

Many suppressors can be cleaned in an ultrasonic cleaner or wet tumbled in appropriate media to dissolve and remove carbon buildup from baffles without mechanical damage.

Question 31: When pressing a new barrel into a Ruger 10/22 receiver, the barrel must be indexed correctly. What determines correct index (rotational position)?

Alignment of the barrel band stud hole with the stock inletting
The front sight position relative to the muzzle threads
Alignment of the barrel's v-block groove with the receiver's v-block cutouts (Correct answer)
The position of the extractor groove in the barrel extension

Correct answer: Alignment of the barrel's v-block groove with the receiver's v-block cutouts

The barrel's v-block groove must align with the receiver's v-block cutouts so the two v-block screws can clamp the barrel securely and properly.

Question 32: A semi-automatic pistol consistently fails to feed the last round from a magazine. The most logical first diagnostic step is to:

Replace the recoil spring assembly
Replace the extractor with an oversized unit
Polish the feed ramp to a mirror finish
Inspect and measure the magazine follower angle and spring tension (Correct answer)

Correct answer: Inspect and measure the magazine follower angle and spring tension

Last-round feed failures most often result from a weak or canted magazine follower that does not present the final cartridge at the correct angle for the slide to chamber it.

Question 33: What is the recommended method for removing a broken screw that is flush with the surface in a firearm receiver?

Welding a nut to the broken screw stub
Drilling out with a standard bit immediately
Using a screw extractor after center-punching and drilling a pilot hole (Correct answer)
Applying penetrating oil and waiting 48 hours only

Correct answer: Using a screw extractor after center-punching and drilling a pilot hole

Center-punching to prevent drill wander, drilling a pilot hole, then using an extractor is the controlled method least likely to damage the surrounding receiver material.

Question 34: A customer's antique revolver has extensive pitting on the cylinder. To preserve collector value while improving safety, the gunsmith should:

Polish all pitting out to bare metal and re-blue the cylinder
Sleeve the cylinder with a thin steel liner
Measure wall thickness at the pits and advise the owner if safe — use minimal material removal and period-correct finish (Correct answer)
Weld-fill all pits and re-machine the cylinder to original dimensions

Correct answer: Measure wall thickness at the pits and advise the owner if safe — use minimal material removal and period-correct finish

Preserving as much original material and finish patina as possible while measuring remaining wall thickness at the pit depth determines structural safety without harming collector value.

Question 35: When polishing the feed ramp of a 1911-style pistol, the gunsmith should avoid removing material from which area?

The lower throat of the barrel's feed ramp
The frame ramp below the barrel hood
The junction of the frame ramp and the barrel ramp (the ramp-to-ramp transition) (Correct answer)
The top surface of the barrel hood

Correct answer: The junction of the frame ramp and the barrel ramp (the ramp-to-ramp transition)

Removing material at the ramp-to-ramp transition creates a gap or ledge that catches cartridge noses, causing the very feed failures the polish was meant to prevent.

Question 36: Which lathe operation is used to cut the crown at the muzzle end of a rifle barrel to protect rifling and ensure accuracy?

Recessing or countersinking using a tool ground to the desired crown angle (Correct answer)
Parting off
Facing with a standard turning tool
Knurling

Correct answer: Recessing or countersinking using a tool ground to the desired crown angle

A crown is cut by recessing the muzzle face at a specific angle or radius using a properly ground cutting tool to uniformly protect all rifling lands at the exit point.

Question 37: When re-crowning a rifle barrel, which tool is most appropriate for producing a target-grade recessed crown?

Flat-face end mill
Standard drill bit run in reverse
11-degree carbide cutter with a pilot (Correct answer)
Bench grinder with a wire wheel

Correct answer: 11-degree carbide cutter with a pilot

An 11-degree carbide cutter with a pilot centers itself in the bore and cuts a consistent, precise recessed crown that protects the rifling and improves accuracy.

Question 38: Which drill bit geometry is best suited for drilling into hardened steel during gunsmithing repairs?

Spade bit
Carbide-tipped or cobalt drill bit (Correct answer)
Standard high-speed steel twist bit
Brad-point wood bit

Correct answer: Carbide-tipped or cobalt drill bit

Carbide-tipped or cobalt drill bits maintain cutting edges at the high temperatures generated when drilling hardened steel.

Question 39: What are the four basic components of a centerfire metallic cartridge?

Shell, cap, charge, projectile
Case, primer, powder, bullet (Correct answer)
Neck, head, primer, projectile
Brass, percussion cap, powder, slug

Correct answer: Case, primer, powder, bullet

A centerfire cartridge consists of a brass (or other metal) case, a primer seated in the case head, propellant powder, and a bullet.

Question 40: What does a 'function check' (or function test) verify after a gunsmith completes work on a firearm?

That the finish is evenly applied
That all mechanical functions — safety, trigger, feeding, ejection — operate correctly before returning the firearm to the customer (Correct answer)
That all screws are tightened to maximum torque
That the sight picture is correct

Correct answer: That all mechanical functions — safety, trigger, feeding, ejection — operate correctly before returning the firearm to the customer

A function check systematically tests each mechanical operation of the firearm to confirm safe and reliable function before the customer receives it.

Question 41: Why should a gunsmith test the fit of all parts AFTER applying a new finish?

To confirm the finish was applied to internal parts as well
Coatings add measurable thickness that can affect tolerances, requiring fitting to restore proper clearances (Correct answer)
Testing fit after finishing is not necessary if parts fit before finishing
Finishes change the color of mating surfaces, making inspection easier

Correct answer: Coatings add measurable thickness that can affect tolerances, requiring fitting to restore proper clearances

Even thin coatings like Cerakote add material thickness that can cause binding in tight-tolerance areas, requiring the gunsmith to fit parts back to specification.

Question 42: When stippling a polymer pistol frame for improved grip, what is the most important precaution to prevent damage?

Using only metal stippling tools
Using low heat and testing on a scrap piece to prevent melting through the frame wall (Correct answer)
Cooling the polymer with water during stippling
Applying oil to the polymer before stippling

Correct answer: Using low heat and testing on a scrap piece to prevent melting through the frame wall

Polymer frames can melt through quickly with excessive heat; testing on scrap material and using controlled, low-temperature passes prevents damaging the frame structurally.

Question 43: What causes copper fouling in a rifle bore and how is it treated?

Copper from bullet jackets deposits in the bore grooves; treated with an ammonia-based copper solvent (Correct answer)
Lead from cast bullets plates the bore; treated with lead solvent
Water vapor condenses and oxidizes; treated with rust remover
Unburned powder sticks to the bore; treated with carbon solvent

Correct answer: Copper from bullet jackets deposits in the bore grooves; treated with an ammonia-based copper solvent

Jacketed bullets leave copper deposits in the rifling grooves, which must be removed with ammonia-based solvents specifically designed to dissolve copper.

Question 44: What is the primary purpose of a full metal jacket (FMJ) bullet?

Improved accuracy at long range
Reduced recoil
Consistent feeding and reduced barrel fouling without expansion (Correct answer)
Maximum expansion on impact

Correct answer: Consistent feeding and reduced barrel fouling without expansion

FMJ bullets have a lead core enclosed in a harder metal jacket that promotes reliable feeding, reduces bore fouling from lead, and does not expand on impact.

Question 45: What is the purpose of a chamber cast in gunsmithing inspection?

To create a physical impression of the chamber for precise dimensional measurement or to identify damage (Correct answer)
To protect the chamber from rust during storage
To resize a chamber to correct dimensions
To mark the chamber for identification purposes

Correct answer: To create a physical impression of the chamber for precise dimensional measurement or to identify damage

A chamber cast uses a low-melting alloy (such as Cerrosafe) poured into the chamber to create a precise replica of its dimensions for measurement or damage assessment.

Question 46: What is the function of a reamer pilot when chambering a rifle barrel?

Centering the reamer precisely in the bore to ensure the chamber is concentric (Correct answer)
Cutting the chamber throat
Locking the barrel in the lathe chuck
Measuring the depth of the chamber cut

Correct answer: Centering the reamer precisely in the bore to ensure the chamber is concentric

The pilot fits snugly in the bore ahead of the reamer's cutting section, keeping the chamber concentric with the bore axis to ensure accurate bullet alignment.

Question 47: What is a 'proof test' and who typically performs it?

A customer acceptance test performed at a shooting range
A visual inspection of the barrel for cracks
A gunsmith's standard function check using live ammunition
A test in which a firearm is fired with a specially loaded overpressure round to verify structural integrity — typically performed by proof houses or manufacturers (Correct answer)

Correct answer: A test in which a firearm is fired with a specially loaded overpressure round to verify structural integrity — typically performed by proof houses or manufacturers

Proof testing uses cartridges generating significantly higher than maximum pressure to verify the firearm's structural integrity, performed under controlled conditions by certified proof houses.

Question 48: What is 'polishing' in the context of firearm finishing, and when is it appropriate?

Mechanically smoothing metal surfaces to remove scratches and machine marks — used to achieve bright, mirror-like finishes or prepare surfaces for certain coatings (Correct answer)
Applying buffing compound after Cerakote curing
Applying a chemical polish to the exterior — required before all finishes
Using steel wool to remove old bluing before re-bluing

Correct answer: Mechanically smoothing metal surfaces to remove scratches and machine marks — used to achieve bright, mirror-like finishes or prepare surfaces for certain coatings

Polishing uses progressively finer abrasives to produce a smooth, reflective surface, appropriate for bright-work finishes or as prep for specific coatings requiring a smooth substrate.

Question 49: What does a 'go gauge' verify during a headspace check?

That the bolt will close fully on the minimum acceptable headspace dimension (Correct answer)
That the headspace exceeds safe limits
That the barrel is properly torqued
That the headspace is at maximum allowed dimension

Correct answer: That the bolt will close fully on the minimum acceptable headspace dimension

A GO gauge represents the minimum acceptable headspace; if the bolt closes fully on the GO gauge, the headspace is not too tight for safe functioning.

Question 50: What type of materials are commonly used in gunsmithing metalworking?

Only wood is used in metalworking
Plastic is the main material used
Only copper and gold are used
Steel, aluminum, brass, and stainless steel are commonly used (Correct answer)

Correct answer: Steel, aluminum, brass, and stainless steel are commonly used

Gunsmithing metalworking commonly utilizes a variety of robust materials, each chosen for specific properties crucial to firearm construction. Steel, aluminum, brass, and stainless steel are frequently used due to their strength, durability, corrosion resistance, and machinability. These materials ensure the firearm can withstand the stresses of firing, maintain structural integrity, and provide long-lasting performance.

Question 51: During stock refinishing, a gunsmith discovers checking that has been partially filled with old finish. The best method to restore crisp, sharp checking is to:

Use a single-cut checkering file to deepen and clean out the grooves, then re-run border lines (Correct answer)
Apply acetone with a stiff brush and then re-checker over the filled grooves
Strip the stock with caustic stripper and allow the checking to self-clear
Sand the stock flat and apply new checkering at a coarser LPI

Correct answer: Use a single-cut checkering file to deepen and clean out the grooves, then re-run border lines

A single-cut checkering file is run through each groove to remove old finish and re-define the diamonds before re-cutting the borders.

Question 52: What is the purpose of using a snap cap during dry-fire practice and maintenance?

To measure trigger pull weight
To simulate live-fire recoil
To test the extractor function
To protect the firing pin and chamber from the stress of dry-firing on an empty chamber (Correct answer)

Correct answer: To protect the firing pin and chamber from the stress of dry-firing on an empty chamber

Snap caps absorb the impact of the firing pin in firearms where dry-firing on an empty chamber can damage the firing pin tip or breech face.

Question 53: In a gas-operated semi-automatic rifle, where is propellant gas typically tapped to cycle the action?

From a port in the barrel forward of the chamber (Correct answer)
Near the muzzle end of the barrel
At the chamber
Through the ejection port

Correct answer: From a port in the barrel forward of the chamber

Gas is tapped from a port drilled in the barrel, typically several inches forward of the chamber, to drive the bolt carrier rearward.

Question 54: What is a 'lead check' inspection of a revolver cylinder?

Measuring the cylinder gap
Inspecting the cylinder for lead shaving or buildup at the forcing cone and cylinder throats (Correct answer)
Verifying the cylinder rotates the correct direction
Checking for cracks in the cylinder using lead dye

Correct answer: Inspecting the cylinder for lead shaving or buildup at the forcing cone and cylinder throats

A lead check inspection examines the cylinder throat openings and forcing cone for lead shaving, which indicates the cylinder throats or forcing cone are out of dimensional specification.

Question 55: What is the purpose of a 'tang' sight base being lapped (inlet) directly to a rifle's receiver tang?

To match the blueing color of the sight to the receiver
To ensure full metal-to-metal contact for a solid, wobble-free mount (Correct answer)
To prevent the sight from rotating under recoil
To allow the sight to pivot for windage adjustment

Correct answer: To ensure full metal-to-metal contact for a solid, wobble-free mount

Lapping the sight base to the tang achieves 100% contact, which eliminates movement under recoil and ensures repeatable zero.

Question 56: What is the function of the magazine follower?

To lock the magazine into the firearm
To seal the bottom of the magazine
To indicate when the magazine is empty
To push cartridges upward in the magazine for feeding (Correct answer)

Correct answer: To push cartridges upward in the magazine for feeding

The magazine follower sits atop the magazine spring and pushes cartridges upward to present them for feeding into the chamber.

Question 57: What is the primary role of the recoil spring in a semi-automatic pistol?

It holds the magazine in place
It drives the firing pin forward
It returns the slide to battery and absorbs recoil energy (Correct answer)
It controls the trigger pull weight

Correct answer: It returns the slide to battery and absorbs recoil energy

The recoil spring stores energy as the slide moves rearward and returns the slide forward to chamber the next round.

Question 58: What precaution must be taken when bluing stainless steel firearms?

Stainless steel is blued identically to carbon steel
Stainless steel must be Parkerized before bluing
Stainless must be heated to 600°F before standard bluing chemicals will bond
Standard hot bluing chemistry does not work on stainless steel — special processes like electrochemical blackening or coatings must be used (Correct answer)

Correct answer: Standard hot bluing chemistry does not work on stainless steel — special processes like electrochemical blackening or coatings must be used

Stainless steel's chromium content resists the standard hot-salt bluing reaction, requiring alternative processes like electrochemical blackening or spray coatings.

Question 59: When polishing a metal surface through successive grits before bluing, what is the finest abrasive typically required for a high-polish blue?

400 to 600-grit followed by polishing compound (Correct answer)
220-grit sandpaper
150-grit cloth
80-grit to remove machining marks only

Correct answer: 400 to 600-grit followed by polishing compound

Achieving a deep blue requires progressing through grits up to 400–600 and finishing with polishing compound to remove micro-scratches that would appear as gray streaks after bluing.

Question 60: What is 'chamber pressure' and how is it typically measured in the US?

The force of the bolt closing — measured in foot-pounds
The atmospheric pressure inside the chamber before firing — measured in bar
The pressure needed to extract the case — measured in pounds of force
The peak pressure generated by burning propellant — measured in PSI or CUP (Correct answer)

Correct answer: The peak pressure generated by burning propellant — measured in PSI or CUP

Chamber pressure is the peak gas pressure generated when propellant burns, measured in PSI (pounds per square inch) or CUP (Copper Units of Pressure).

Question 61: What chemical is used in the hot bluing process to create the black oxide layer on steel?

A hot caustic solution of sodium hydroxide, potassium nitrate, and sodium nitrite at approximately 285–310°F (Correct answer)
Hydrochloric acid
Sulfuric acid heated to 400°F
Ferric chloride dissolved in distilled water

Correct answer: A hot caustic solution of sodium hydroxide, potassium nitrate, and sodium nitrite at approximately 285–310°F

Hot bluing uses a caustic salt bath (sodium hydroxide mixed with oxidizing salts) maintained at controlled temperature to convert the steel surface to Fe3O4 (black oxide).

Question 62: A customer wants to convert their Ruger 10/22 to a bull barrel configuration. What must the gunsmith verify before recommending an aftermarket bull barrel?

The color and finish preferences of the customer
The ammunition brand the customer prefers
That the stock's barrel channel is wide enough to accept the larger diameter, or that a new stock is used (Correct answer)
The magazine capacity

Correct answer: That the stock's barrel channel is wide enough to accept the larger diameter, or that a new stock is used

A bull barrel has a larger outside diameter than the factory barrel; the stock's barrel channel must be opened up or replaced to accommodate the larger profile and achieve proper or free-float fit.

Question 63: How does parts replacement affect firearm performance?

It decreases the firearm's overall value
It increases the weight of the firearm
It reduces the firearm’s recoil
It ensures proper functioning and safety of the firearm (Correct answer)

Correct answer: It ensures proper functioning and safety of the firearm

Parts replacement significantly affects firearm performance by ensuring proper functioning and safety. When worn, broken, or incorrect parts are replaced with appropriate, high-quality components, the firearm's mechanical integrity is restored. This ensures that all mechanisms operate as designed, leading to reliable cycling, consistent accuracy, and preventing potential safety hazards that could arise from faulty components.

Question 64: What is the primary purpose of draw filing a metal surface?

Hardening the surface of the metal
Producing a fine, smooth finish by dragging the file sideways (Correct answer)
Creating deep grooves for checkering
Removing large amounts of material quickly

Correct answer: Producing a fine, smooth finish by dragging the file sideways

Draw filing involves pushing or pulling a file laterally across the work to refine and smooth a surface after regular filing.

Question 65: What tool is used to clean the forcing cone area of a revolver barrel?

A lead-lapping tool
A bore snake
A cotton swab with solvent
A brass brush sized for the caliber, run from the cylinder gap side (Correct answer)

Correct answer: A brass brush sized for the caliber, run from the cylinder gap side

A brass brush sized to the caliber can be inserted from the cylinder gap side to scrub carbon buildup from the forcing cone and barrel throat.

Question 66: What does it mean if a firearm exhibits 'trigger creep'?

The trigger resets very slowly after firing
The trigger physically moves sideways during firing
The trigger requires too much force to pull
The trigger moves rearward a significant distance before the sear releases, instead of a clean break (Correct answer)

Correct answer: The trigger moves rearward a significant distance before the sear releases, instead of a clean break

Trigger creep is the takeup or movement of the trigger prior to the sear release, often felt as a gritty or mushy movement before the shot breaks.

Question 67: What is 'sight radius' on a firearm?

The diameter of a rear aperture sight
The adjustment range of a fully adjustable rear sight
The distance between the front and rear sights (Correct answer)
The field of view provided by an optical scope

Correct answer: The distance between the front and rear sights

Sight radius is the measured distance between the front and rear sights; a longer radius reduces angular aiming error and generally improves practical accuracy.

Question 68: What does a 'go' gauge confirm when checking chamber dimensions?

The chamber is too short and needs reaming
The chamber is cut to maximum allowable dimensions
The barrel throat is properly aligned with the chamber
The bolt will close on a cartridge at minimum safe headspace (Correct answer)

Correct answer: The bolt will close on a cartridge at minimum safe headspace

A go gauge is machined to minimum headspace; if the bolt closes on it, the chamber is at least at minimum safe dimensions and will accept factory ammunition.

Question 69: What is bore erosion and what causes it?

Mechanical wear and heat erosion caused by the passage of hot, high-pressure gases and bullets (Correct answer)
Pitting caused by improper cleaning solvents
Lead buildup from cast bullets
Rust from moisture; prevented by keeping the bore dry

Correct answer: Mechanical wear and heat erosion caused by the passage of hot, high-pressure gases and bullets

Bore erosion is the gradual wear of the rifling lands and grooves caused by the abrasive and heat effects of high-pressure propellant gases and bullet passage.

Question 70: Which rust bluing step is responsible for converting the initial red iron oxide into the desired black magnetite (Fe3O4)?

Carding the part with a wire wheel or card brush
Applying the rusting solution with a swab
Boiling the part in distilled water (Correct answer)
Dipping the part in a degreasing solution

Correct answer: Boiling the part in distilled water

Boiling the rust-coated part in distilled water converts the red ferric oxide (Fe2O3) to black magnetite (Fe3O4), which is the durable rust-blue finish.

Question 71: What is 'Cerakote' and what are its primary advantages over traditional bluing?

A polymer-ceramic coating baked onto the metal — advantages include superior corrosion resistance, abrasion resistance, and wide color options (Correct answer)
A cold chemical treatment — advantage is no heat required
A hot-salt bluing process — advantage is lower cost
An electroplating process — advantage is extreme hardness

Correct answer: A polymer-ceramic coating baked onto the metal — advantages include superior corrosion resistance, abrasion resistance, and wide color options

Cerakote is a thermally cured polymer-ceramic finish that outperforms bluing in corrosion, chemical, and abrasion resistance while offering many color choices.

Question 72: What is the purpose of 'timing' a revolver barrel during installation?

Aligning the extractor rod with the barrel bore
Setting the barrel to the correct headspace length only
Balancing the barrel weight for accuracy
Ensuring the front sight is vertically aligned when the barrel is torqued to specification (Correct answer)

Correct answer: Ensuring the front sight is vertically aligned when the barrel is torqued to specification

Barrel timing means the front sight stands perfectly upright when the barrel shoulder is fully torqued against the frame, achieved by indexing cuts on the barrel or frame.

Question 73: Which type of steel is most commonly used for rifle barrels due to its combination of strength and machinability?

4140 chromoly steel (Correct answer)
440C stainless steel
1018 mild steel
Tool steel D2

Correct answer: 4140 chromoly steel

4140 chromoly steel offers an excellent balance of tensile strength, toughness, and machinability that makes it the industry standard for rifle barrels.

Question 74: What is the function of CLP (Cleaner, Lubricant, Protectant)?

It removes copper fouling exclusively
It is used only as a rust preventive coating
It serves as a combined cleaner, lubricant, and corrosion protectant in one product (Correct answer)
It is a solvent for plastic and polymer parts

Correct answer: It serves as a combined cleaner, lubricant, and corrosion protectant in one product

CLP is a multi-purpose product formulated to simultaneously clean fouling, lubricate moving parts, and protect metal surfaces from corrosion.

Question 75: Which action type is most commonly found on double-barrel shotguns?

Bolt-action
Semi-automatic
Break-action (Correct answer)
Pump-action

Correct answer: Break-action

Break-action shotguns hinge at the receiver, allowing the barrels to tilt downward for loading and unloading.

Question 76: Which type of sighting system requires the most precise and permanent installation due to its zero-sum adjustment method?

Fixed iron sight (dovetail style) (Correct answer)
Peep sight with click adjustments
Red dot optic on a Picatinny rail
Ghost ring rear sight

Correct answer: Fixed iron sight (dovetail style)

Fixed dovetail sights have no elevation or windage adjustment screws — they must be precisely drifted or cut to the correct position during installation to achieve proper zero.

Question 77: What is a 'pin punch set' used for in firearm disassembly and assembly?

Driving out drift pins, roll pins, and cross pins that retain components in the action (Correct answer)
Removing stuck cases from chambers
Installing scope rings without marring the finish
Checking chamber concentricity

Correct answer: Driving out drift pins, roll pins, and cross pins that retain components in the action

Pin punches are used to drive out the various pins that hold firearm components (trigger groups, barrel keys, sights) in place during disassembly.

Question 78: How does barrel rifling influence firearm accuracy?

It stabilizes the projectile and improves accuracy (Correct answer)
It reduces the firearm’s recoil
It increases the bullet’s velocity
It improves the firearm's stopping power

Correct answer: It stabilizes the projectile and improves accuracy

Barrel rifling profoundly influences firearm accuracy by imparting a spin to the projectile as it travels down the barrel. This gyroscopic spin stabilizes the bullet in flight, preventing it from tumbling and ensuring a consistent, predictable trajectory. Without rifling, bullets would yaw and tumble erratically, severely compromising accuracy and range.

Question 79: Why is it important to match parts during firearm restoration?

It reduces the firearm's overall value
It enhances the firearm's weight distribution
It only impacts the appearance of the firearm
It ensures proper function and safety of the firearm (Correct answer)

Correct answer: It ensures proper function and safety of the firearm

Matching parts during firearm restoration is crucial because it ensures the proper function and safety of the firearm. Firearms are designed with specific tolerances and interactions between components; using mismatched or improperly fitted parts can lead to dangerous malfunctions, premature wear, or complete failure. Correctly matched parts maintain the firearm's original design integrity, guaranteeing reliable and safe operation.

Question 80: What does checking for 'cylinder lockup' in a revolver assess?

Whether the cylinder latch is properly installed
Whether the cylinder indexes correctly and locks solidly in alignment with the barrel under firing conditions (Correct answer)
Whether the ejector rod is the correct length
Whether the cylinder crane is bent

Correct answer: Whether the cylinder indexes correctly and locks solidly in alignment with the barrel under firing conditions

Cylinder lockup checks that the cylinder rotates to full index and is firmly locked in alignment with the barrel and forcing cone, preventing off-axis bullet travel.

Question 81: What is the first step in firearm repair?

Diagnosing the problem through visual and functional inspection (Correct answer)
Replacing all parts with new ones
Disassembling the firearm completely
Cleaning the firearm thoroughly

Correct answer: Diagnosing the problem through visual and functional inspection

The first and most critical step in firearm repair is diagnosing the problem through a thorough visual and functional inspection. Before any work begins, a gunsmith must accurately identify the root cause of the malfunction or issue. This diagnostic process ensures that the correct repairs are performed, preventing unnecessary work and guaranteeing the firearm's safe and reliable operation post-repair.

Question 82: What is 'Parkerizing' and on what type of metal is it typically applied?

A polymer spray coating applied to aluminum frames
A manganese or zinc phosphate coating applied to steel and iron for corrosion resistance (Correct answer)
An electroless nickel process applied to titanium
A chrome-plating process used on stainless steel

Correct answer: A manganese or zinc phosphate coating applied to steel and iron for corrosion resistance

Parkerizing is a phosphate conversion coating process that creates a matte gray-green surface on steel, used extensively on military firearms for corrosion resistance.

Question 83: Which cleaning method is correct for maintaining the lens coatings on a rifle scope?

Rinsing with hot tap water followed by air drying
Using lens-specific cleaning solution and a microfiber or lens tissue only (Correct answer)
Polishing with automotive lens restorer to remove micro-scratches
Using household ammonia-based glass cleaner applied with a paper towel

Correct answer: Using lens-specific cleaning solution and a microfiber or lens tissue only

Scope lens coatings are precision anti-reflective treatments that are permanently damaged by ammonia, abrasives, or harsh chemicals; only dedicated optical cleaning solutions and lint-free microfiber cloths should be used.

Question 84: What is 'cold bluing' and how does it differ from 'hot bluing'?

Cold bluing is a type of Parkerizing; hot bluing is a polymer coating
They are identical processes applied at different speeds
Cold bluing uses selenium dioxide-based solutions applied at room temperature; hot bluing uses hot caustic salt baths for a more durable finish (Correct answer)
Cold bluing uses an oven; hot bluing uses room-temperature chemicals

Correct answer: Cold bluing uses selenium dioxide-based solutions applied at room temperature; hot bluing uses hot caustic salt baths for a more durable finish

Cold bluing provides a quick but less durable finish using room-temperature chemicals, while hot bluing in caustic salt baths produces a harder, more corrosion-resistant oxide layer.

Question 85: A gunsmith needs to tap a hole for a 10-32 scope base screw. What drill size should be used for the tap drill?

No. 19 (0.166")
No. 25 (0.1495")
No. 21 (0.159") (Correct answer)
No. 29 (0.136")

Correct answer: No. 21 (0.159")

A No. 21 drill (0.159") provides approximately 75% thread engagement, which is standard practice for 10-32 threads in firearm applications.

Question 86: Why is it important to use original parts during firearm repair?

Non-original parts are always superior for performance
Using original parts ensures the firearm operates as designed (Correct answer)
Original parts are unnecessary for firearm repair
Original parts increase the firearm's recoil

Correct answer: Using original parts ensures the firearm operates as designed

It is important to use original parts during firearm repair because it ensures the firearm operates exactly as designed by the manufacturer. Original parts are engineered to specific tolerances and material specifications, guaranteeing optimal fit, function, and safety within the firearm's system. Using non-original or aftermarket parts that don't meet these standards can compromise reliability, introduce safety risks, or diminish the firearm's performance and value.

Question 87: A shotgun with a loose action body-to-stock joint is being repaired. After tightening the stock bolt, the correct next step is to:

Pin the action to the stock with a roll pin through the receiver
Sand the stock inlet slightly larger for a free-floating fit
Bed the action in the stock using an epoxy bedding compound (Correct answer)
Spray the joint with penetrating oil to prevent future loosening

Correct answer: Bed the action in the stock using an epoxy bedding compound

Epoxy bedding fills micro-gaps and creates a perfect, stress-free mating surface between the action and stock, eliminating the play that causes looseness.

Question 88: What is the purpose of 'bead blasting' or 'sandblasting' a firearm's metal parts before finishing?

To apply a chemical conversion coating in one step
To remove metal to reduce weight
To create a uniform matte surface texture that improves coating adhesion and hides machining marks (Correct answer)
To harden the metal surface through peening

Correct answer: To create a uniform matte surface texture that improves coating adhesion and hides machining marks

Abrasive blasting produces a consistent, clean surface profile that maximizes coating adhesion and gives a uniform, non-reflective appearance.

Question 89: A double-action revolver's trigger pull is excessively heavy. Which spring is most often replaced or reduced to improve DA pull weight?

Mainspring (hammer spring) (Correct answer)
Trigger rebound spring
Crane lock spring
Cylinder latch spring

Correct answer: Mainspring (hammer spring)

The mainspring (hammer spring) is the primary contributor to double-action trigger pull weight, and replacing it with a reduced-power unit is the standard approach.

Question 90: When should a gunsmith use a toothbrush-style cleaning brush during maintenance?

To remove lead fouling from the cylinder
To clean the bore
To apply oil to the bore
To scrub carbon and debris from action components, rails, and recesses (Correct answer)

Correct answer: To scrub carbon and debris from action components, rails, and recesses

Small stiff-bristled brushes are ideal for scrubbing carbon fouling and debris from slide rails, trigger groups, and other small recesses in the action.

Question 91: What does inspecting a firearm's crown involve?

Examining the muzzle end of the barrel for damage, burrs, or uneven wear that could affect accuracy (Correct answer)
Checking the finish on the receiver
Checking the bore for copper fouling
Measuring the height of the front sight

Correct answer: Examining the muzzle end of the barrel for damage, burrs, or uneven wear that could affect accuracy

The crown is the muzzle end of the barrel where the bullet exits; even minor damage to the crown can cause asymmetric gas release and degrade accuracy.

Question 92: What does 'timing' refer to in revolver inspection, and what happens when timing is off?

The gap between double-action and single-action pull weights
The speed at which the cylinder latch engages
The trigger reset speed — poor timing causes slow follow-up shots
The synchronization of cylinder rotation so each chamber is fully indexed with the barrel before the hammer falls — poor timing causes bullets to shave lead or miss the bore entirely (Correct answer)

Correct answer: The synchronization of cylinder rotation so each chamber is fully indexed with the barrel before the hammer falls — poor timing causes bullets to shave lead or miss the bore entirely

Revolver timing ensures the cylinder is fully locked in alignment with the barrel at the moment of firing — out-of-time revolvers can shave lead, damage the forcing cone, and create dangerous conditions.

Question 93: In a bolt-action rifle, what is the purpose of the locking lugs?

To guide the bolt into the receiver
To assist in extracting the spent case
To lock the bolt securely against the receiver to contain chamber pressure (Correct answer)
To prevent the bolt from over-rotating

Correct answer: To lock the bolt securely against the receiver to contain chamber pressure

Locking lugs engage recesses in the receiver to securely lock the bolt in place, safely containing the high pressures generated during firing.

Question 94: Why is it important to understand the firearm's function before performing customizations?

It’s not important if the firearm looks aesthetically pleasing
It reduces the customization costs
It ensures safety and functionality during and after customization (Correct answer)
It allows for random modifications without checking safety

Correct answer: It ensures safety and functionality during and after customization

Understanding a firearm's function before performing customizations is critically important to ensure both safety and functionality. Without this knowledge, modifications could inadvertently compromise the firearm's mechanical integrity, leading to dangerous malfunctions or rendering it inoperable. A thorough understanding allows the gunsmith to make informed decisions that enhance performance without sacrificing reliability or user safety.

Question 95: When welding on a firearm receiver for a repair, which welding process provides the most precise, low-heat-input weld suitable for small areas?

MIG (GMAW) welding
Oxy-acetylene gas welding
Flux-core arc welding
TIG (GTAW) welding (Correct answer)

Correct answer: TIG (GTAW) welding

TIG welding provides precise arc control, lower heat input, and minimal spatter, making it ideal for small, precise repairs on firearm receivers where distortion must be minimized.

Question 96: When using a surface grinder to true a receiver face, what grinding wheel specification is appropriate for hardened steel?

Diamond CBN wheel only
Coarse silicon carbide wheel
Felt buffing wheel with compound
Fine aluminum oxide wheel rated for hardened steel (Correct answer)

Correct answer: Fine aluminum oxide wheel rated for hardened steel

Fine-grit aluminum oxide wheels are standard for precision surface grinding of hardened steel receiver faces, providing controlled material removal without burning.

Question 97: How should a gunsmith properly store a cleaned firearm to prevent rust?

Store in a sealed airtight case without oil
Apply heavy grease to all exterior surfaces
Apply a light coat of oil to metal surfaces and store in a low-humidity environment (Correct answer)
Wrap tightly in plastic with no air exposure

Correct answer: Apply a light coat of oil to metal surfaces and store in a low-humidity environment

A light coat of oil on metal surfaces displaces moisture and prevents oxidation, and storing in a low-humidity environment further reduces corrosion risk.

Question 98: Which part of a revolver rotates to align each chamber with the barrel?

The crane
The frame
The cylinder (Correct answer)
The yoke

Correct answer: The cylinder

The cylinder rotates with each trigger pull or hammer cock to index a new chamber in line with the barrel.

Question 99: What is parallax error in a rifle scope, and when does it occur?

Chromatic lens distortion that blurs the target image at high magnification
Vertical drift of the point of impact caused by barrel heating
The apparent movement of the reticle relative to the target when the shooter's eye moves off the optical axis (Correct answer)
Mechanical backlash in the windage or elevation turrets

Correct answer: The apparent movement of the reticle relative to the target when the shooter's eye moves off the optical axis

Parallax error occurs when the target image and reticle are focused on different planes inside the scope, causing the reticle to appear to shift relative to the target as the shooter's eye position changes.

Question 100: What is the correct procedure when using a barrel vise and action wrench to remove a stubborn barrel from a rifle action?

Remove the barrel extension first, then use an impact driver on the shank
Apply heat to the receiver threads with a torch, then turn with the action wrench
Clamp the barrel firmly in the vise and rotate the action wrench clockwise when viewed from the muzzle
Clamp the barrel firmly in the vise and rotate the action wrench counter-clockwise when viewed from the muzzle (Correct answer)

Correct answer: Clamp the barrel firmly in the vise and rotate the action wrench counter-clockwise when viewed from the muzzle

Standard barrel threads are right-hand, so the action (receiver) must be turned counter-clockwise (when viewed from the muzzle) to unscrew it from the barrel.

NRA National Rifle Association Certified Gunsmith

The NRA Certified Gunsmith exam tests knowledge and skills across firearm mechanics, metalworking, woodworking, repair and restoration, finishing techniques, and safety inspection required for professional gunsmithing certification through NRA-approved schools.

100

Questions

120 min

Time Limit

70%

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