CMMG Dissent Mk3 .308 Winchester 12.5 inch Upper Receiver 1-10 Twist 5/8 x 24 ZEROED Linear Compensator Cerakote/Hard Coat Anodized. 308 caliber the shorter barrel length may not have the long range performance but makes up for it in maneuverability and storage. Utilizing patent pending direct impingement Compact Action DISSENT upper groups house the entire action and recoil assembly in the upper receiver resulting in less bulk and length than traditional ARs. The forward non-reciprocating side charger allows for quick bolt operation without coming off target. All DISSENT Upper groups include a 1913 Picatinny rail end plate to use in place of the lower receiver buffer tube. Upper groups are available in your choice from seven Cerakote finish options. Specifications for CMMG Dissent Mk3 .308 Winchester 12.5 inch Upper Receiver: Manufacturer: CMMG Caliber: .308 Winchester Barrel Length: 12.5 in Barrel Twist Rate: 1-10 Muzzle Device: Zeroed Linear Compensator Finish: Cerakote/Hard Coat Anodize Gun Type: Rifle Gun Make: CMMG Gun Model: CMMG Mk3 Weight: 5.5 lb Barrel Material: 4140 Chrome Moly Vanadium Features of CMMG Dissent Mk3 .308 Winchester 12.5 inch Upper Receiver Adjustable Gas Block Lifetime Quality Guarantee Package Contents: CMMG Dissent Mk3 .308 Winchester 12.5 inch Upper Receiver What firearm models does the manufacturer say CMMG Dissent Mk3 .308 Winchester 12.5 inch Upper Receiver is compatible with? The manufacturer suggests that CMMG Dissent Mk3 .308 Winchester 12.5 inch Upper Receiver is compatible with CMMG Mk3CMMG 38B3D0C-HCA: Dissent Mk3 .308 Winchester 12.5 inch Upper Receiver 1-10 Twist 5/8 x 24 ZEROED Linear Compensator Cerakote/Hard Coat Anodized