CRFSC Major Parts and Actions 2 — Questions and Answers
Question 1: What is the function of the extractor on a semi-automatic pistol?
- It feeds rounds from the magazine into the chamber
- It grips the rim of the cartridge case to pull it from the chamber (Correct answer)
- It strikes the primer of the cartridge to fire it
- It holds the slide in the open position after the last round
Correct answer: It grips the rim of the cartridge case to pull it from the chamber
The extractor is a spring-loaded hook that grips the cartridge rim and pulls the spent case out of the chamber during cycling.
Question 2: On a bolt-action rifle, what is the primary purpose of the locking lugs?
- To guide the bolt into the receiver during cycling
- To secure the bolt to the barrel during firing, containing chamber pressure (Correct answer)
- To cock the firing pin as the bolt is closed
- To eject the spent cartridge case after firing
Correct answer: To secure the bolt to the barrel during firing, containing chamber pressure
Locking lugs are projections on the bolt head that rotate into matching recesses in the receiver, securing the bolt and safely containing the high pressures generated when a round fires.
Question 3: What part of a double-action revolver allows the shooter to fire without manually cocking the hammer?
- The transfer bar
- The hand (or pawl)
- The trigger linkage that cocks and drops the hammer in one pull (Correct answer)
- The cylinder latch
Correct answer: The trigger linkage that cocks and drops the hammer in one pull
In double-action mode, a single long trigger pull simultaneously cocks the hammer (or an internal striker) and releases it to fire the cartridge.
Question 4: Which component in a semi-automatic rifle's gas-operated system first receives propellant gas tapped from the barrel?
- The bolt carrier key (gas key)
- The buffer tube
- The piston or gas tube (Correct answer)
- The recoil spring
Correct answer: The piston or gas tube
In a gas-operated system, propellant gas is tapped through a port in the barrel and travels through the gas tube (or acts on a piston) before impinging on the bolt carrier to cycle the action.
Question 5: What is the purpose of the ejector in a semi-automatic firearm?
- To remove live rounds from the magazine
- To strike the case and flip it clear of the action after extraction (Correct answer)
- To lock the slide open after the last round
- To feed the next cartridge from the magazine
Correct answer: To strike the case and flip it clear of the action after extraction
The ejector is a fixed or spring-loaded component that strikes the base of the extracted cartridge case, kicking it out of the action.
Question 6: On a pump-action shotgun, what connects the fore-end (slide handle) to the bolt assembly?
- The action bars (slide bars) (Correct answer)
- The magazine tube
- The carrier assembly
- The trigger group
Correct answer: The action bars (slide bars)
Action bars (also called slide bars) link the fore-end directly to the bolt, so rearward and forward strokes of the fore-end cycle the action.
Question 7: What is the function of the disconnector in a semi-automatic firearm's trigger group?
- It disconnects the magazine from the firearm for safe unloading
- It prevents the firearm from firing when the action is not fully closed
- It resets the trigger by catching the hammer until the trigger is released (Correct answer)
- It blocks the firing pin when the safety is engaged
Correct answer: It resets the trigger by catching the hammer until the trigger is released
The disconnector catches the hammer after each shot and holds it until the shooter releases the trigger, ensuring only one round fires per trigger pull.
CRFSC Major Parts and Actions 2
What is the function of the extractor on a semi-automatic pistol?