NRA Firearm Customization & Modifications 2

Question 1

When installing a match-grade barrel on a semi-automatic pistol, which specification is most critical for reliable feeding?

Accepted Answer

Chamber throat geometry and feed ramp angle

Answer

The chamber throat geometry and feed ramp angle directly control how cartridges transition from the magazine into the chamber, making them critical for reliable feeding.

Question 2

A customer wants a crisp, light trigger pull on their AR-15 for competition use. Which component replacement most directly reduces trigger pull weight?

Accepted Answer

Trigger and hammer springs

Answer

Replacing the trigger and hammer springs with reduced-power versions is the most direct method for decreasing trigger pull weight in an AR-15.

Question 3

What is the purpose of pillar bedding in a bolt-action rifle stock?

Accepted Answer

To provide rigid, dimensionally stable anchor points for action screws

Answer

Pillar bedding installs metal pillars in the stock that provide solid, consistent anchor points for action screws, preventing compression and improving accuracy.

Question 4

Which recoil pad installation technique ensures a professional, flush fit with no gaps between the pad and stock heel?

Accepted Answer

Grinding the pad on a disc sander using a jig to match the stock angle

Answer

Using a disc sander with a jig to hold the stock allows precise material removal until the pad face perfectly matches the stock's angle and contour.

Question 5

When threading a rifle muzzle for a suppressor, what is the most important safety check before beginning the threading operation?

Accepted Answer

Confirming the bore is centered with the barrel's outside diameter using a dial indicator

Answer

Confirming concentricity between the bore and the barrel's OD with a dial indicator ensures the threads are centered with the bore, preventing baffle strikes.

(NRA) National Rifle Association Certified Gunsmith Practice Test

(NRA) National Rifle Association Certified Gunsmith Practice Test

NRA Firearm Customization & Modifications 2