NRA Metalworking & Woodworking for Gunsmithing 5

Question 1

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

Accepted Answer

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

Answer

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.

Question 2

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

Accepted Answer

400 to 600-grit followed by polishing compound

Answer

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.

Question 3

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?

Accepted Answer

Feeler gauges to check clearance at the hood

Answer

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

Question 4

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

Accepted Answer

American black walnut

Answer

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.

Question 5

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

Accepted Answer

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

Answer

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.

(NRA) National Rifle Association Certified Gunsmith Practice Test

(NRA) National Rifle Association Certified Gunsmith Practice Test

NRA Metalworking & Woodworking for Gunsmithing 5