NRA National Rifle Association Certified Gunsmith — Questions and Answers

Question 1: What does a gunsmith check when inspecting a bolt for locking lug engagement?

That the lugs clear the receiver when the bolt is cycled
That the lugs contact their recesses fully and evenly to distribute firing pressure safely (Correct answer)
That the locking lugs are symmetrical in length for even load distribution
That the lug surfaces are polished to a mirror finish

Correct answer: That the lugs contact their recesses fully and evenly to distribute firing pressure safely

Uneven or insufficient lug engagement concentrates stress on fewer lugs, risking failure under high chamber pressure; all lugs should bear evenly on their receiver recesses.

Question 2: A gunsmith is parkerizing a military-specification rifle. After the phosphate conversion coating is applied, the FINAL required step is:

Polishing the surface with 0000 steel wool to bring out the sheen
Immersing or saturating the part in oil while still warm to seal the porous coating (Correct answer)
Sandblasting the part again to open the pores before storage
Applying a clear coat lacquer to prevent future oxidation

Correct answer: Immersing or saturating the part in oil while still warm to seal the porous coating

Parkerizing produces a porous surface that must be sealed with oil (applied while the part is warm for best penetration) to provide corrosion resistance and the characteristic matte appearance.

Question 3: What is the best way to remove lead fouling from a revolver bore?

Use a brass brush aggressively without solvent
Use a lead removal cloth or a Lewis Lead Remover (Correct answer)
Use hot water and dish soap
Use a copper brush with copper solvent

Correct answer: Use a lead removal cloth or a Lewis Lead Remover

A Lewis Lead Remover or lead-removing cloth uses a tight bronze or brass mesh to mechanically remove deposited lead from the bore without scratching the rifling.

Question 4: When silver soldering a front sight to a barrel, what is the correct flux application sequence?

Apply flux to cold, clean metal before heating (Correct answer)
Apply flux only to the solder wire
Flux is not required for silver soldering
Apply flux after heating the joint

Correct answer: Apply flux to cold, clean metal before heating

Flux must be applied to clean, cold metal before heating to prevent oxidation and ensure proper solder flow.

Question 5: When a gunsmith's employee handles firearms during normal shop operations, what federal background check requirement applies to the employee?

No federal requirements apply to employees as the FFL license covers all shop activity
Each employee must pass a NICS check every time they handle a customer's firearm
Employees need a separate FFL in their own name to legally handle firearms
Employees of an FFL are not required to pass NICS checks but must not be prohibited persons (Correct answer)

Correct answer: Employees of an FFL are not required to pass NICS checks but must not be prohibited persons

Employees of an FFL are 'responsible persons' who must not be prohibited from possessing firearms, but they do not individually undergo NICS checks for handling guns in the scope of employment.

Question 6: Under the National Firearms Act (NFA), which of the following items requires registration and a $200 tax stamp?

A shotgun with an 18.5-inch barrel
A standard semi-automatic pistol with a 4-inch barrel
A rifle with a folding stock and 18-inch barrel
A short-barreled rifle (SBR) with a barrel under 16 inches (Correct answer)

Correct answer: A short-barreled rifle (SBR) with a barrel under 16 inches

The NFA regulates short-barreled rifles (barrel length under 16 inches or overall length under 26 inches), requiring registration and a $200 tax.

Question 7: What is 'Tennifer' (also known as Melonite or QPQ) as used on Glock slides?

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

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

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

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 9: What is the legal barrel length minimum for a rifle to avoid NFA classification as a short-barreled rifle?

18 inches
16 inches (Correct answer)
20 inches
14 inches

Correct answer: 16 inches

A rifle must have a barrel of at least 16 inches to avoid being classified as a short-barreled rifle (SBR) under the NFA.

Question 10: What lubricant is appropriate for a firearm's wooden stock hardware?

Linseed oil or stock finish appropriate to the wood type (Correct answer)
CLP
White lithium grease
Light machine oil

Correct answer: Linseed oil or stock finish appropriate to the wood type

Linseed oil or appropriate stock finishing oils condition and protect wooden stocks without the mineral oil components that can swell or discolor wood.

Question 11: When installing an extended magazine release on a Glock pistol, what tool is required to remove the factory magazine catch?

A 3/32-inch punch to depress the locking block pin and a 1/8-inch punch to drive the magazine catch pin (Correct answer)
A spanner wrench
A Torx T10 driver
A brass punch and mallet

Correct answer: A 3/32-inch punch to depress the locking block pin and a 1/8-inch punch to drive the magazine catch pin

Glock magazine catch removal requires depressing the locking block pin with one punch while driving the magazine catch pin out with another, a two-punch process unique to Glock disassembly.

Question 12: What is the purpose of using 'snap caps' during a function check or dry-fire testing?

To simulate live fire for trigger pull measurement only
To test ammunition compatibility before buying in bulk
Snap caps are decorative and have no functional purpose
To protect the firing pin and chamber from damage during dry-fire practice and to test feeding, extraction, and ejection reliably (Correct answer)

Correct answer: To protect the firing pin and chamber from damage during dry-fire practice and to test feeding, extraction, and ejection reliably

Snap caps simulate cartridges during dry-fire and function checks, protecting firing pins (especially in rimfire guns) and allowing extraction/ejection testing.

Question 13: When inletting a receiver, a gunsmith uses inletting black (prussian blue). What does this compound reveal?

Moisture content of the stock blank
High contact points between the metal action and wood that need further removal (Correct answer)
Areas where the metal is hardest
Wood grain direction for checkering layout

Correct answer: High contact points between the metal action and wood that need further removal

Inletting black transfers from the metal onto wood high spots when the action is pressed into the inlet, showing exactly where additional wood must be removed for full bedding contact.

Question 14: What is the primary purpose of a full metal jacket (FMJ) bullet?

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

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 15: What is the primary use of an ultrasonic cleaner in a gunsmith shop?

To remove bluing from metal parts before rebluing
To test spring tension
To polish metal surfaces to a mirror finish
To clean small parts and assemblies using high-frequency vibration in a solvent bath (Correct answer)

Correct answer: To clean small parts and assemblies using high-frequency vibration in a solvent bath

Ultrasonic cleaners use high-frequency sound waves to agitate a solvent bath, loosening and removing carbon, grease, and fouling from complex parts and small assemblies.

Question 16: What is the significance of fitting a custom barrel to a firearm?

It is primarily for visual appearance
It is only needed for firearms with worn-out barrels
It ensures better performance and accuracy (Correct answer)
It reduces the firearm's weight

Correct answer: It ensures better performance and accuracy

Fitting a custom barrel to a firearm is highly significant for enhancing its performance and accuracy. A precisely machined and fitted barrel can optimize bullet stability and velocity, leading to tighter groupings and improved shot consistency. This customization allows gunsmiths to tailor the firearm to specific shooting disciplines or ammunition types, maximizing its potential for precision.

Question 17: 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 18: What is 'cold bluing' and how does it differ from 'hot bluing'?

Cold bluing uses an oven; hot bluing uses room-temperature chemicals
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 is a type of Parkerizing; hot bluing is a polymer coating
They are identical processes applied at different speeds

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 19: How does gunsmithing metalworking affect firearm longevity?

It has no impact on firearm longevity
It decreases the overall functionality of the firearm
It only impacts the firearm's appearance
It helps improve longevity by ensuring proper part fitting and material durability (Correct answer)

Correct answer: It helps improve longevity by ensuring proper part fitting and material durability

Gunsmithing metalworking directly impacts firearm longevity by ensuring proper part fitting and material durability. When components are precisely manufactured and assembled, wear and tear are minimized, extending the firearm's operational life. Additionally, selecting and working with high-quality, durable metals helps the firearm withstand repeated use and environmental exposure, preserving its functionality over time.

Question 20: Why is it important to maintain proper film thickness when applying spray-on coatings like Cerakote?

Thicker coatings are always better for durability
Improper thickness causes dimensional changes that can affect part fit, function, and tolerance-critical areas (Correct answer)
Only the color is affected by film thickness
Coating thickness has no impact on firearm function

Correct answer: Improper thickness causes dimensional changes that can affect part fit, function, and tolerance-critical areas

Coating thickness must stay within specification (typically 0.001" for Cerakote) to avoid binding in tight-tolerance areas like bores, chambers, and locking surfaces.

Question 21: What is the primary purpose of metalworking in gunsmithing?

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

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 22: Why must metal surfaces be thoroughly degreased before applying a bluing or Parkerizing finish?

Oils increase chemical reactivity and cause uneven color
It is only required for hot bluing, not cold processes
Contaminants prevent the chemical conversion reaction from occurring uniformly, resulting in spotty or failed finish (Correct answer)
Grease accelerates the process and causes over-bluing

Correct answer: Contaminants prevent the chemical conversion reaction from occurring uniformly, resulting in spotty or failed finish

Any oil, grease, or contamination blocks the chemical conversion coating from bonding with the metal, causing an inconsistent or failed finish.

Question 23: When re-lining a damascus shotgun barrel with a modern steel tube, the critical safety test after completion is:

A function test using standard field loads
A headspace check with go and no-go gauges
A boroscope inspection of the liner weld seam
A hydraulic or pneumatic proof test to a pressure significantly above maximum service pressure (Correct answer)

Correct answer: A hydraulic or pneumatic proof test to a pressure significantly above maximum service pressure

Re-lined barrels must be proof-tested at elevated pressure to confirm the liner, adhesive bond, and outer tube can withstand safe service pressure before any live ammunition is fired.

Question 24: What is 'rifling twist rate' and how does it affect bullet stabilization?

The number of grooves in the bore — more grooves means slower spin
The angle of the rifling relative to the bore axis — affects muzzle velocity only
The depth of the rifling grooves — determines gas leakage
The rate at which the rifling imparts spin to a bullet — faster twist stabilizes heavier, longer bullets (Correct answer)

Correct answer: The rate at which the rifling imparts spin to a bullet — faster twist stabilizes heavier, longer bullets

Twist rate (e.g., 1:10 inches) determines how many inches of travel equal one full bullet rotation; heavier, longer bullets need faster twist to be stabilized.

Question 25: What is the primary reason a gunsmith uses a pillar bedding system rather than full-length glass bedding in a rifle stock?

Pillars allow the barrel to free-float without any additional inletting
Pillar bedding reduces stock weight significantly compared to full glass bedding
Pillar bedding is stronger than epoxy and resists cracking under recoil
Steel pillars prevent the action screws from over-torquing and crushing the stock material, maintaining consistent torque (Correct answer)

Correct answer: Steel pillars prevent the action screws from over-torquing and crushing the stock material, maintaining consistent torque

Aluminum or steel pillars provide incompressible surfaces against which the action screws tighten, so torque remains consistent over time without the wood compressing.

Question 26: What chemical is used in the hot bluing process to create the black oxide layer on steel?

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

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

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
The lower throat of the barrel's feed ramp

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 28: How does woodworking contribute to firearm comfort and ergonomics?

It customizes grips and stocks for better comfort and ergonomics (Correct answer)
It only improves the aesthetic value of the firearm
It improves the firearm's firing speed
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 29: What is the purpose of a 'tang' sight base being lapped (inlet) directly to a rifle's receiver tang?

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
To match the blueing color of the sight to the receiver

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 30: What is the function of a chamber reamer?

To remove burrs from the muzzle crown
To resize the barrel bore diameter
To smooth the bore rifling
To cut or finish the chamber to the correct dimensions in a new or rebarreled firearm (Correct answer)

Correct answer: To cut or finish the chamber to the correct dimensions in a new or rebarreled firearm

A chamber reamer is a precision cutting tool that cuts the chamber to SAAMI-specified dimensions, ensuring correct headspace and a properly formed chamber.

Question 31: What is a 'borescope' and why is it valuable in gunsmithing?

A pressure-testing instrument inserted through the bore
A device that measures bore diameter at multiple points
A tool that measures chamber concentricity
A small camera or optical instrument inserted into the bore for detailed visual inspection of the rifling, throat, and crown (Correct answer)

Correct answer: A small camera or optical instrument inserted into the bore for detailed visual inspection of the rifling, throat, and crown

A borescope allows the gunsmith to visually inspect the full length of the bore for erosion, pitting, fouling, cracks, or obstructions without disassembly.

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.

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35 min

Time Limit

70%

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