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 Caliber: 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 What firearm models does the manufacturer say CMMG Mk4 5.7X28mm Resolute Upper Group Receiver is compatible with? The manufacturer suggests that CMMG Mk4 5.7X28mm Resolute Upper Group Receiver is compatible with CMMG Mk4CMMG 57B40E4-MB: Mk4 5.7X28mm Resolute Upper Group Receiver 16.1in Midnight Bronze