CMMG Mk4 5.7X28mm Resolute Upper Group Receiver 16.1in Midnight Bronze

CMMG Mk4 5.7X28mm Resolute Upper Group Receiver 16.1in Midnight Bronze. 7x28mm have become a big thing in the last few years and if youre looking for PDW ballistics and the classic style and balance of a carbine then youre in luck. Combine this RESOLUTE Upper Group with either our Mk57 Lower or a standard AR15 lower group and CMMGs 5.7 AR Conversion Magazines and youll be ready to hit the range Specifications for CMMG Mk4 5.7X28mm Resolute Upper Group Receiver: Manufacturer: CMMG Cartridge: 5.7x28mm Overall Length: 25.3 in Barrel Length: 16.1 in Barrel Profile: Medium Tapered Barrel Twist Rate: 1-9 Threads per Inch: 1/2x28 Muzzle Device: CMMG Zeroed Muzzle Brake Fabric/Material: 6061-T6 Aluminum Gun Rail: M-LOK Gun Make: CMMG Gun Model: CMMG Mk4 Weight: 4 lb Magazine Included: No Mount Type: M-LOK Package Contents: CMMG Mk4 5.7X28mm Resolute Upper Group Receiver CMMG 57B40E4-MB: Mk4 5.7X28mm Resolute Upper Group Receiver 16.1in Midnight Bronze