Metalworking & Woodworking for Gunsmithing Flashcards

What is the purpose of 'timing' a revolver barrel during installation?

Answer: Ensuring the front sight is vertically aligned when the barrel is torqued to specification

Barrel timing means the front sight stands perfectly upright when the barrel shoulder is fully torqued against the frame, achieved by indexing cuts on the barrel or frame.

When polishing a metal surface through successive grits before bluing, what is the finest abrasive typically required for a high-polish blue?

Answer: 400 to 600-grit followed by polishing compound

Achieving a deep blue requires progressing through grits up to 400–600 and finishing with polishing compound to remove micro-scratches that would appear as gray streaks after bluing.

A gunsmith is fitting a new semi-automatic pistol barrel. What tool is used to measure the fit between the barrel hood and the slide's breech face?

Answer: Feeler gauges to check clearance at the hood

Feeler gauges allow the gunsmith to precisely measure the clearance between the barrel hood and breech face to ensure correct headspace and reliable feeding.

Which wood species is traditionally preferred for high-quality rifle stocks because of its strength-to-weight ratio and oil finish compatibility?

Answer: American black walnut

American black walnut offers excellent strength, moderate weight, attractive figure, and bonds well with linseed-based oil finishes, making it the traditional premium stock wood.

When inletting a receiver, a gunsmith uses inletting black (prussian blue). What does this compound reveal?

Answer: High contact points between the metal action and wood that need further removal

Inletting black transfers from the metal onto wood high spots when the action is pressed into the inlet, showing exactly where additional wood must be removed for full bedding contact.

What is the function of a reamer pilot when chambering a rifle barrel?

Answer: Centering the reamer precisely in the bore to ensure the chamber is concentric

The pilot fits snugly in the bore ahead of the reamer's cutting section, keeping the chamber concentric with the bore axis to ensure accurate bullet alignment.

When welding on a firearm receiver for a repair, which welding process provides the most precise, low-heat-input weld suitable for small areas?

Answer: TIG (GTAW) welding

TIG welding provides precise arc control, lower heat input, and minimal spatter, making it ideal for small, precise repairs on firearm receivers where distortion must be minimized.