The CMMG .22LR Barrel and Bolt kit provides everything you need to convert your existing upper to a dedicated .22LR. Just purchase a magazine and you are ready to go. 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. 16.1" Barrel .22 Long Rifle Barrel and Bolt combo Mfg: Cmmg
