Swapping your AR-15 bolt carrier group with a CMMG .22 Long Rifle conversion bolt group takes only seconds. This unique kit is also compatible with piston driven rifles, due to the blow back operation. This design is similar to other popular semi auto .22 rifles, is is proven to be reliable. The Bravo conversion kit is stainless steel, which makes it much easier to clean. Includes a standard 10 round .22 Long Rifle magazine.