Ultra-fine, steel bristles in a unique, square shape get into tight corners to remove stubborn receiver fouling fast, without damaging the firearm. Originally designed for the M60 machine gun; works equally well to scrub out baked-on carbon deposits from inside AR-15 and shotgun receivers. Heavy-duty, looped and wound, steel shank provides extra strength and rigidity. Threaded brass coupling wonX’Xt mar lightweight, aluminum receivers. Mfg: Brownells SPECS: 8-32 thread. Bristles – 3" (7.6cm) long, 1" (2.5cm) wide. 4 1/2" (11.4cm) overall length.
