CMMG Dissent Mk4 .350 Legend 16.1in Upper Group 1-16 Twist 1/2x28 TPI 25.5.in .750in Armor Black. Utilizing our 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 AR pistols. The forward non-reciprocating side charger allows for quick bolt operation without coming off target. Direct impingement DISSENTS come equipped with a left side charger standard. Right side charging handles for DI models are available here. All DISSENT Upper groups include a 1913 Picatinny rail end plate to use in place of the lower receiver buffer tube. Specifications for CMMG Dissent Mk4 .350 Legend 16.1in Upper Group: Manufacturer: CMMG Caliber: .350 Legend Muzzle Device: CMMG Zeroed Muzzle Brake Finish: Cerakote Fabric/Material: Aluminum Gun Make: CMMG Gun Model: CMMG Mk4 Package Contents: CMMG Dissent Mk4 .350 Legend 16.1in Upper Group What firearm models does the manufacturer say CMMG Dissent Mk4 .350 Legend 16.1in Upper Group is compatible with? The manufacturer says that CMMG Dissent Mk4 .350 Legend 16.1in Upper Group is compatible with CMMG Mk4CMMG 35B1AOC-AB: Dissent Mk4 .350 Legend 16.1in Upper Group 1-16 Twist 1/2x28 TPI 25.5.in .750in Armor Black