DealWhen modularity, affordability, and quality are all important the Mk4 T is the complete upper of choice. The Mk4 T introduces CMMG's RKM series of KeyMod free float hand guards. The 22LR features a nitrided 4140 CrMo M4 profile barrel. Caliber: 22LR Barrel: 16 medium weight taper profile* from American War Machines (Product RS-CMMG22B7CA4) |