MSR/AR owners know the importance of a clean bolt and bolt carrier group. Carbon and fouling can build-up in these areas, causing jams and malfunctions. The B.O.N.E. Tool was designed specifically to clean the bolt carrier assembly area of .223 Cal/5.56 mm rifles or 7.62 mm rifles. This quick-clean tool serves these purposes: scrapes carbon and fouling from the Bolt, Bolt Carrier, and Firing Pin. It includes a 8-32 threaded hole to act as a T-handle. Note: While this tool fits many bolts flawlessly, it may fit some bolts better than others due to variance in bolts by different manufacturers.