NRA NRA Firearm Mechanics & Operation 2

Question 1

What is the primary function of the recoil spring in a semi-automatic pistol?

Accepted Answer

To return the slide forward and absorb recoil energy

Answer

To cock the hammer

Answer

To eject the spent case

Answer

To feed ammunition from the magazine

Question 2

What is the term for the condition when a firearm's bolt or slide is fully forward and locked into battery?

Accepted Answer

In battery

Answer

Cocked and locked

Answer

Cycled

Answer

Indexed

Question 3

What determines the lock time of a firearm?

Accepted Answer

The time from trigger release to primer ignition

Answer

The weight of the trigger pull

Answer

The length of the barrel

Answer

The rate of the recoil spring

Question 4

What is the function of the gas port in a gas-operated semi-automatic rifle?

Accepted Answer

To bleed propellant gas to cycle the action

Answer

To vent excess pressure safely

Answer

To cool the barrel

Answer

To regulate chamber pressure

Question 5

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

Accepted Answer

To lock the bolt securely against the receiver to contain chamber pressure

Answer

To guide the bolt into the receiver

Answer

To assist in extracting the spent case

Answer

To prevent the bolt from over-rotating

Question 6

What is the purpose of the ejector in a firearm?

Accepted Answer

To kick the spent case clear of the action after extraction

Answer

To remove live rounds from the magazine

Answer

To lock the slide open after the last round

Answer

To feed rounds into the chamber