CMMG Magazine, 22 LR, 10 Rounds, Fits AR15/MK4 Rifles, Black 22AFC77 CMMG's 22LR 10rd magazine combines the proven functionality of their original 22ARC magazines with all new exterior styling to match the looks of the lineup of firearms and other conversion magazines. It features a 10-round capacity and is compatible with .22LR conversion kits and CMMG Mk4/mil-spec AR15 lower receivers.