This AR Rifle Chamber Brush 5.56mm NATO .223 Multi Pack is designed for cleaning AR-15/M4 and M16 rifles. It includes a two-piece brush set for 5.56mm NATO and .223 caliber rifles, compatible with standard American gun cleaning rod kits featuring 8-32 threads. The set consists of a phosphor bronze chamber brush with stainless steel bristles and a bore brush, suitable for all AR rifle barrels in .223 and 5.56mm. These brushes help maintain rifle bores and chambers by preventing carbon residue buildup, thereby enhancing accuracy and performance in .223 Remington and 5.56mm AR-style rifles.