NRA NRA Firearm Inspection & Testing 2

Question 1

What is a proof load and what is its purpose?

Accepted Answer

An overpressure test cartridge used to verify structural integrity of a barrel or action

Answer

Proof loads are cartridges loaded to a pressure significantly higher than standard maximum to test whether a barrel, action, or complete firearm can safely withstand extreme pressure.

Question 2

What is the purpose of checking barrel crown concentricity?

Accepted Answer

To ensure the muzzle end is uniformly cut perpendicular to the bore for consistent bullet exit

Answer

A concentric, perpendicular crown allows propellant gases to release uniformly around the bullet as it exits, maintaining bullet stability and maximizing accuracy.

Question 3

What does it mean if a firearm exhibits 'trigger creep'?

Accepted Answer

The trigger moves rearward a significant distance before the sear releases, instead of a clean break

Answer

Trigger creep is the takeup or movement of the trigger prior to the sear release, often felt as a gritty or mushy movement before the shot breaks.

Question 4

What is a 'lead check' inspection of a revolver cylinder?

Accepted Answer

Inspecting the cylinder for lead shaving or buildup at the forcing cone and cylinder throats

Answer

A lead check inspection examines the cylinder throat openings and forcing cone for lead shaving, which indicates the cylinder throats or forcing cone are out of dimensional specification.

Question 5

What condition does a gunsmith check for when examining a semi-automatic pistol's extractor tension?

Accepted Answer

Whether the extractor applies sufficient spring tension to grip the cartridge rim for reliable extraction and feeding

Answer

Proper extractor tension ensures the extractor snaps over the cartridge rim during feeding and maintains firm contact for reliable extraction after firing.

(NRA) National Rifle Association Certified Gunsmith Practice Test

(NRA) National Rifle Association Certified Gunsmith Practice Test

NRA NRA Firearm Inspection & Testing 2