Keep your AR-15 M16 Rifle in perfect working condition with Original military style design 5.56 NATO .223 cal. Chamber Brushes, they fits AR-15, M-16, M4, AR-10 rifles. 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 Cleaning Rod 8-32 thread).