NRA NRA Firearm Mechanics & Operation 1 — Questions and Answers
Question 1: What is the function of the firing pin in a firearm?
- To eject the spent case
- To strike the primer and initiate ignition (Correct answer)
- To feed the next cartridge
- To cock the hammer
Correct answer: To strike the primer and initiate ignition
The firing pin strikes the primer of the cartridge, initiating the ignition sequence that fires the round.
Question 2: In a semi-automatic pistol, what component strips the cartridge from the magazine and chambers it?
- The ejector
- The extractor
- The slide/bolt face (Correct answer)
- The feed ramp
Correct answer: The slide/bolt face
The slide (or bolt face) strips the top cartridge from the magazine and chambers it as it moves forward.
Question 3: What is the purpose of the disconnector in a semi-automatic firearm?
- To disconnect the magazine from the frame
- To prevent the trigger from firing multiple rounds per trigger pull (Correct answer)
- To separate the slide from the frame
- To block the firing pin
Correct answer: To prevent the trigger from firing multiple rounds per trigger pull
The disconnector resets the sear after each shot, preventing the firearm from firing more than one round per trigger pull.
Question 4: What is headspace in a firearm?
- The distance between the front and rear sights
- The space between the hammer and firing pin
- The distance from the bolt face to the datum line in the chamber (Correct answer)
- The gap between the cylinder and barrel on a revolver
Correct answer: The distance from the bolt face to the datum line in the chamber
Headspace is the distance from the bolt face to the point in the chamber where the cartridge case is supported, critical for safe and reliable operation.
Question 5: In a double-action revolver, what happens when the trigger is pulled?
- Only the hammer drops
- The cylinder rotates, the hammer cocks, and then falls (Correct answer)
- The hammer must be pre-cocked manually
- The cylinder locks before the hammer falls
Correct answer: The cylinder rotates, the hammer cocks, and then falls
In double-action mode, a single trigger pull simultaneously rotates the cylinder, cocks the hammer, and releases it to fire.
Question 6: What is the role of the extractor in a semi-automatic firearm?
- To feed rounds into the chamber
- To grip and pull the spent case from the chamber after firing (Correct answer)
- To prevent double-feeding
- To hold the slide open after the last round
Correct answer: To grip and pull the spent case from the chamber after firing
The extractor hooks onto the cartridge rim and pulls the spent case out of the chamber as the slide or bolt moves rearward.
NRA NRA Firearm Mechanics & Operation 1
What is the function of the firing pin in a firearm?