Square Profie Brush
Combined Ultra-fine nylon and steel bristles for a unique cleaning brush.  The square shape gets into tight corners to remove stubborn receiver fouling fast.

Originally designed for the M60 machine gun; works equally well to scrub out baked-on carbon deposits from inside AR-15/M4 rifles and shotgun receivers. Heavy-duty, looped and wound, steel brush core provides extra strength and rigidity. #8-32 threaded end.  Made in USA