SDI Hammer-Fired Pistols (FTH 223) Practice Test

Ultrasonic cleaning uses high-frequency sound waves in a cleaning solvent to create cavitation bubbles that aggressively lift carbon, grease, and fouling from metal surfaces. This works best on parts with small crevices, internal passages, or complex geometries—areas common in firearm components like bolts, slides, springs, pins, and firing-pin channels. To access and thoroughly clean these parts, a gunsmith typically disassembles the firearm so each component can be placed in the ultrasonic bath and thoroughly cleaned. Cleaning the firearm without disassembly would leave many areas untouched, making the statement false.