Convert your 5.56/223 AR-15 Rifle to shoot inexpensive .22LR with a CMMG .22LR AR Conversion Kit. Installation is easy and it takes only seconds to swap the standard bolt carrier group for the conversion bolt. 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. Simple Installation - No tools required. Installs in seconds. Save money on ammo - low recoil. It works in most 5.56/.223 chambered rifles. Ships with a Stainless Steel Bolt Group and three 25rd .22LR magazines.