NRA NRA Cleaning & Maintenance

Question 1

What type of solvent is most effective for removing carbon fouling from a firearm bore?

Accepted Answer

Carbon/powder solvent such as Hoppe's No. 9

Answer

Carbon/powder solvents such as Hoppe's No. 9 are specifically formulated to dissolve carbon deposits and powder fouling from the bore and action.

Question 2

What is the correct direction to run a cleaning patch through a rifle barrel?

Accepted Answer

From breech to muzzle, to avoid forcing debris into the action

Answer

Patches should always be pushed from breech to muzzle to prevent debris from being pushed back into the action and to exit the muzzle cleanly.

Question 3

What is the primary risk of over-lubricating a firearm?

Accepted Answer

Attracting dirt and debris, causing malfunctions and potential action sluggishness

Answer

Excess lubricant attracts and holds dirt, grit, and carbon fouling, which can cause malfunctions, and in cold weather, thick oil can slow the action.

Question 4

What is bore erosion and what causes it?

Accepted Answer

Mechanical wear and heat erosion caused by the passage of hot, high-pressure gases and bullets

Answer

Bore erosion is the gradual wear of the rifling lands and grooves caused by the abrasive and heat effects of high-pressure propellant gases and bullet passage.

Question 5

What tool is used to clean the forcing cone area of a revolver barrel?

Accepted Answer

A brass brush sized for the caliber, run from the cylinder gap side

Answer

A brass brush sized to the caliber can be inserted from the cylinder gap side to scrub carbon buildup from the forcing cone and barrel throat.

(NRA) National Rifle Association Certified Gunsmith Practice Test

(NRA) National Rifle Association Certified Gunsmith Practice Test

NRA NRA Cleaning & Maintenance