~100 rounds through it. Built from a NIB Colt LE6920 SOCOM. Colt 14.5 SOCOM profile barrel w/ p/w SF 4 prong. Colt bcg. Geissele gas block. Upper assembly, gas block pin, and muzzle device pin/weld performed by d.wilson mfg. Black creek, GA marked surplus RIS II rail. PRI gas buster ch.