Original style military design 5.56 NATO .223 cal. AR-15 chamber brush design to fits AR-15, M-16, M4, AR-10 This Chamber Brush has .223 Bronze bristles fit chamber, longer, stainless steel tufts clean locking lug recesses. On the AR-10 it cleans the larger .308 chamber used on these rifles. (Direct threading into any standard AR15 Cleaning Rod 8-32 thread).
