CMMG AR Conversion Kit Bravo, 22LR, Conversion Bolt and Magazine, 25Rd, Stainless Finish 22BA6E1 Just swap this drop in conversion with the bolt carrier group from your 5.56/.223 chambered rifle and you will be ready to shoot .22LR. Ships with One 25rd 22LR magazines. For best performance use a round style hammer as notched hammers can cause function issues and 36 grain plated nose bullets have proven to be the best choice for function.