CRFSC Major Parts and Actions 3 — Questions and Answers
Question 1: What is the role of the barrel's crown (the recessed end of the muzzle)?
- To reduce muzzle flash by slowing escaping gases
- To protect the rifling at the muzzle and ensure uniform gas release for accuracy (Correct answer)
- To attach a muzzle device such as a suppressor or flash hider
- To prevent dirt from entering the barrel when stored
Correct answer: To protect the rifling at the muzzle and ensure uniform gas release for accuracy
A properly cut crown protects the vulnerable end of the rifling and ensures propellant gases escape evenly around the bullet, which is critical for consistent accuracy.
Question 2: In a lever-action rifle, which component strips a round from the magazine and positions it for chambering as the lever is worked?
- The carrier (lifter) (Correct answer)
- The extractor
- The gate spring
- The hammer spur
Correct answer: The carrier (lifter)
The carrier (or lifter) rises to catch a round from the tubular magazine and align it with the chamber as the lever is closed.
Question 3: What distinguishes an 'open' bolt design from a 'closed' bolt design in a firearm?
- Open bolt fires with the bolt forward; closed bolt fires with the bolt held rearward
- Open bolt fires with the bolt held rearward; closed bolt fires with the bolt forward (Correct answer)
- Open bolt uses no extractor; closed bolt requires a separate ejector
- Open bolt is found only on revolvers; closed bolt only on semi-automatics
Correct answer: Open bolt fires with the bolt held rearward; closed bolt fires with the bolt forward
In an open-bolt design the bolt rests rearward until the trigger is pulled, then moves forward to chamber and fire the round; closed-bolt designs keep a round chambered with the bolt forward.
Question 4: What is the function of the magazine follower?
- It locks the magazine into the magazine well
- It pushes rounds upward under spring tension so they feed reliably (Correct answer)
- It limits the magazine to a legal capacity
- It strips rounds from the magazine and feeds them into the chamber
Correct answer: It pushes rounds upward under spring tension so they feed reliably
The follower is a platform pushed upward by the magazine spring, keeping rounds elevated and properly angled so they feed reliably into the action.
Question 5: On a semi-automatic pistol, what component holds the firing pin (or striker) under spring tension until released by the trigger?
- The sear (Correct answer)
- The disconnector
- The slide stop
- The backstrap
Correct answer: The sear
The sear engages a notch on the hammer or striker and holds it cocked under spring tension until the trigger pull causes the sear to release it.
Question 6: What is the purpose of the forcing cone in a revolver barrel?
- It aligns the cylinder with the barrel during rotation
- It provides a tapered transition that guides the bullet from the cylinder into the rifled bore (Correct answer)
- It prevents gas blowback from the cylinder gap
- It acts as the rear sight reference point on a revolver
Correct answer: It provides a tapered transition that guides the bullet from the cylinder into the rifled bore
The forcing cone is a tapered section at the breech end of the revolver barrel that guides the bullet from the slightly misaligned cylinder into the rifled bore without distortion.
Question 7: What part of a semi-automatic pistol feeds cartridges from the magazine into the chamber?
- The barrel ramp (feed ramp) (Correct answer)
- The extractor claw
- The slide rails
- The recoil spring guide rod
Correct answer: The barrel ramp (feed ramp)
The feed ramp is a polished inclined surface on the barrel or frame that guides the nose of the cartridge upward and into the chamber as the slide moves forward.
CRFSC Major Parts and Actions 3
What is the role of the barrel's crown (the recessed end of the muzzle)?