NRA Tool Usage & Shop Equipment Flashcards

What is the purpose of a barrel vise in gunsmithing?

Answer: To securely hold the barrel while torquing or removing the action from the barrel

A barrel vise clamps around the barrel using non-marring inserts to hold it securely while applying torque to install or remove the action or muzzle devices.

What is a headspace gauge set used for in gunsmithing?

Answer: To verify that a chamber's headspace dimension is within safe specifications using GO, NO-GO, and FIELD gauges

Headspace gauge sets use GO, NO-GO, and FIELD gauges to confirm that the chamber headspace is within SAAMI-specified tolerances for safe operation.

What is an action wrench used for?

Answer: To provide torque on the receiver when removing or installing barrels

An action wrench fits the receiver and provides a controlled point to apply torque when threading barrels on or off, preventing damage to the action.

What is the purpose of a trigger pull gauge?

Answer: To measure the force required to fire the firearm by pulling the trigger to the break point

A trigger pull gauge measures the amount of force, typically in ounces or pounds, required to pull the trigger to the point where the firearm fires.

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

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.

What is a receiver action block used for?

Answer: To hold the receiver securely in a vise without marring the receiver finish

An action block clamps into the receiver and provides a solid grip point for the vise to hold the action securely without damaging the receiver's exterior finish.