NRA NRA Tools & Equipment for Gunsmithing

Question 1

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

Accepted Answer

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

Answer

A set of bore brushes for cleaning different calibers

Answer

Gauges that measure barrel wall thickness

Answer

Instruments used to check trigger pull weight

Question 2

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

Accepted Answer

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

Answer

To hold the barrel while painting

Answer

To clamp the barrel to a workbench for cleaning

Answer

To measure barrel straightness

Question 3

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

Accepted Answer

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

Answer

A special wrench for installing scope rings

Answer

A wrench used to adjust trigger pull weight

Answer

A tool for removing barrel keys from lever-action rifles

Question 4

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

Accepted Answer

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

Answer

Measuring the distance of trigger travel

Answer

Checking trigger return spring tension

Answer

Measuring the width of the trigger blade

Question 5

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

Accepted Answer

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

Answer

Phillips-head — standard for all firearms

Answer

Torx bits — used on all modern firearms

Answer

Allen keys — universal for all action screws

Question 6

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

Accepted Answer

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

Answer

To illuminate the trigger group during disassembly

Answer

To check headspace in dim workshop conditions

Answer

To verify proof marks on the barrel