CMMG drop in .22 conversion kit with 1 Smoke Black Dog Machine Magazines and Christie Products loader. This model is semi automatic only. The PRI Gas Buster charging handle will not work with the CMMG .22 Conversion kit. All you need to convert your .223/5.56 AR to shoot .22LR is included in this kit. You simply remove your bolt carrier group and insert the conversion bolt and feed the .22 LR rounds with the included Smoke Black Dog Machine magazines. With ammunition as expensive as it is right now, this is a great way to still use your AR and not have to deplete your savings account.