NRA Tools & Equipment for Gunsmithing Flashcards

What is a 'headspace gauge set' and why is it essential in gunsmithing?

Answer: Go, No-Go, and Field gauges used to verify that chamber headspace is within safe specifications

Headspace gauges (Go, No-Go, Field) verify the critical chamber dimension to ensure safe and reliable cartridge feeding and firing.

What is the purpose of a 'barrel vise' in gunsmithing?

Answer: To securely hold the barrel during barrel removal, installation, or threading operations without damaging the finish

A barrel vise grips the barrel shank securely and without marring while the gunsmith applies torque to remove or install a barrel, or while threading.

What is an 'action wrench' and when is it used?

Answer: A tool that grips the receiver and provides leverage for removing or installing barrels

An action wrench clamps to the receiver and is used in conjunction with a barrel vise to remove or install barrels by applying counter-torque to the action.

What is a 'trigger pull gauge' used for in gunsmithing?

Answer: Measuring the force required to fire a firearm, expressed in ounces or pounds

A trigger pull gauge measures the firing force in ounces or pounds to verify triggers are within manufacturer spec or customer requirements.

What is the correct driver tip type for removing most American firearm screws, and why does it matter?

Answer: Hollow-ground (gunsmith) flathead bits that fully fill the screw slot to prevent cam-out and screw damage

Hollow-ground flathead bits are machined to fit screw slots perfectly from base to top, preventing the cam-out that ruins screw heads with standard tapered flathead drivers.

What is a 'bore light' used for in gunsmithing?

Answer: To illuminate the bore for inspection of rifling condition, cleanliness, and obstructions

A bore light is inserted into the chamber or muzzle to illuminate the bore for visual inspection of the rifling, erosion, pitting, or obstructions.