When modularity, affordability and quality in a 308 WIN package are all important, the Mk3 K is the upper of choice. The Mk3 K is CMMG’s primary short barreled rifle. The Mk3 K includes the RKM11 KeyMod free floating hand guard. The barrel is a nitrided 4140 CrMo steel, 12.5” long barrel chambered in 308 Winchester. Each upper group includes CMMG’s lifetime quality guarantee.
An “AR-15 Pistol” upper assembly has a barrel less than 16” in length. Pistol uppers are only for use on AR-15 pistol lowers and legal Short-Barreled Rifles. Other configurations may violate Federal law.
Installation of AR-15 upper assemblies with certain features including, but not limited to: flash hiders, bayonet lugs, and threaded muzzles may violate state and/or local laws.