NRA Firearm Inspection & Testing Flashcards
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Read the first 6 NRA Firearm Inspection & Testing flashcards as text
What does inspecting a firearm's bore with a light reveal?
Answer: The condition of the rifling, including wear, pitting, fouling, and erosion
Shining a light down the bore while looking from the other end reveals the condition of the lands and grooves, showing fouling, pitting, erosion, and wear patterns.
What is the significance of checking a semi-automatic pistol for 'out-of-battery firing'?
Answer: To verify the safety mechanism prevents firing unless the action is fully closed and locked
Out-of-battery firing occurs when a pistol fires before the slide is fully in battery, which can be extremely dangerous; gunsmiths must verify the safety systems prevent this.
What is an accuracy test and what does it verify for a gunsmith?
Answer: A group-shooting test at a set distance to verify the barrel and action deliver acceptable precision after service
An accuracy test involves firing groups at a specified distance to verify the repaired or serviced firearm produces acceptable group sizes, confirming the mechanical work was successful.
What does a gunsmith check when inspecting a bolt for locking lug engagement?
Answer: That the lugs contact their recesses fully and evenly to distribute firing pressure safely
Uneven or insufficient lug engagement concentrates stress on fewer lugs, risking failure under high chamber pressure; all lugs should bear evenly on their receiver recesses.
What is a function test for a firearm's safety mechanism designed to verify?
Answer: That the firearm cannot fire when the safety is engaged, and fires normally when the safety is disengaged
The safety function test verifies the safety positively blocks firing when engaged and does not impede firing when properly disengaged, confirming the safety functions as designed.
What inspection should a gunsmith perform after installing a new barrel to verify it is properly timed or indexed?
Answer: A headspace check with GO/NO-GO gauges to confirm the chamber is within safe specifications
After any barrel installation or replacement, headspace must be verified with GO/NO-GO gauges to confirm the chamber meets SAAMI specifications before the firearm is test-fired.
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