CMMG Mk3 Resolute Upper Receiver Group .308 Winchester 16.1in Armor Black. 308 Win carbine with the RESOLUTE Mk3 upper group. Combining heavy hitting performance with styling in a league of its own there is no doubt that this upper will set your rifle apart from the crowd. There can be a lot of confusion with .308 AR platforms and compatibility CMMG has kept it simple by basing our Mk3 platform off the popular Gen 1 DPMS High-Pattern LR308 design which means greater parts availability and more customization potential. Specifications for CMMG Mk3 Resolute Upper Receiver Group: Manufacturer: CMMG Caliber: .308 Winchester Barrel Length: 16.1 in Gas System Length: Carbine Length Muzzle Device: CMMG Zeroed Muzzle Brake Color: Armor Black Gun Type: Rifle Gun Make: CMMG Gun Model: CMMG Mk3 Condition: New Magazine Included: No Package Contents: CMMG Mk3 Resolute Upper Receiver Group What firearm models does the manufacturer say CMMG Mk3 Resolute Upper Receiver Group is compatible with? The manufacturer suggests that CMMG Mk3 Resolute Upper Receiver Group is compatible with CMMG Mk3CMMG 38B7D78-AB: Mk3 Resolute Upper Receiver Group .308 Winchester 16.1in Armor Black