NRA NRA Tool Usage & Shop Equipment

Question 1

What is the purpose of a barrel vise in gunsmithing?

Accepted Answer

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

Answer

To hold the barrel while polishing the bore

Answer

To measure barrel dimensions

Answer

To align the barrel with the receiver during assembly

Question 2

What is a headspace gauge set used for in gunsmithing?

Accepted Answer

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

Answer

To measure the depth of rifling

Answer

To check the depth of the barrel crown

Answer

To measure trigger pull weight

Question 3

What is an action wrench used for?

Accepted Answer

To provide torque on the receiver when removing or installing barrels

Answer

To tighten scope ring screws

Answer

To adjust trigger pull weight

Answer

To remove firing pins from bolts

Question 4

What is the purpose of a trigger pull gauge?

Accepted Answer

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

Answer

To measure the length of the trigger shoe

Answer

To set the overtravel of a trigger

Answer

To measure spring tension in the trigger group

Question 5

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

Accepted Answer

To clean small parts and assemblies using high-frequency vibration in a solvent bath

Answer

To polish metal surfaces to a mirror finish

Answer

To remove bluing from metal parts before rebluing

Answer

To test spring tension

Question 6

What is a receiver action block used for?

Accepted Answer

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

Answer

To block the action during transport

Answer

To prevent the trigger from being pulled during disassembly

Answer

To support the receiver during stock fitting