Otis Technology Breech To Muzzle Cleaning System 5.7mm Subgun - FG-223-57.pWhen it comes to tactical competitions or firing long-range free-hand shots, sometimes lightweight is still too heavy. When every ounce counts, carry the tools you need to keep your collapsible stock rifle clean and clear, without sacrificing weight. Specifically designed for all .223 caliber and 5.56MM rifles with a standard hollow grip.