NRA Tool Usage & Shop Equipment Flashcards

What is a borescope used for in gunsmithing?

Answer: To visually inspect the interior of a barrel for erosion, fouling, or defects using an optical device

A borescope is an optical instrument inserted into the bore to provide a close-up visual inspection of the rifling, chamber throat, and bore condition.

What is the purpose of a scope-mounting level set?

Answer: To ensure the scope reticle is perfectly aligned with the bore axis during mounting

A scope-mounting level set uses two bubble levels — one on the rifle and one on the scope — to ensure the reticle is square to the bore, preventing canting errors.

What is the function of a torque wrench in scope mounting?

Answer: To apply a precise, specified amount of torque to scope ring and base screws to prevent under- or over-tightening

A torque wrench ensures scope ring and base screws are tightened to the manufacturer's specified torque value, preventing loose mounts or stripped screws.

What is a stock inlet rasp used for?

Answer: To remove wood from a stock's barrel channel or action inlet for proper fit

A stock inlet rasp is a coarse file-like tool used to remove wood from the barrel channel, action inlet, or other stock areas to achieve proper fit and clearance.

What is the function of a pin punch set in firearm disassembly?

Answer: To drive out roll pins and cross pins during disassembly and reassembly of firearm components

Pin punches are hardened steel tools used to drive pivot pins, roll pins, and cross pins out of and into firearm assemblies during disassembly and reassembly.

What is a magnetic parts tray used for in gunsmithing?

Answer: To catch and organize small parts, springs, and pins during disassembly

Magnetic parts trays hold small metal components, springs, and pins in place during disassembly so they do not roll off the workbench or get lost.