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.
CMMG AR Conversion Kit Bravo, 22LR, Conversion Bolt and Magazine, 25Rd, Stainless Finish 22BA6E1