Firearm Customization & Modifications Flashcards

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

Answer: Chamber throat geometry and feed ramp angle

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.

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

Answer: Trigger and hammer springs

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

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

Answer: To provide rigid, dimensionally stable anchor points for action screws

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

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

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

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.

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

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

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.

A gunsmith is installing an adjustable gas block on an AR-15. What is the primary benefit this modification provides?

Answer: Ability to tune gas flow for reliable cycling with various ammunition and suppressor use

An adjustable gas block allows the operator to fine-tune the amount of gas diverted to cycle the action, enabling reliable function with suppressors, different loads, or subsonic ammunition.

What is the function of a trigger overtravel stop screw in a custom trigger job?

Answer: It limits rearward movement of the trigger after the sear breaks, improving follow-through

An overtravel stop screw limits how far the trigger travels rearward after sear break, reducing movement and helping the shooter maintain sight alignment during the shot.