Personal defense calibers like 5.7x28mm 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: 1/2×28 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
2 reviews for CMMG Mk4 5.7X28mm Resolute Upper Group Receiver
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Ralph –
Just received my 5.7×28 upper. Fit perfect on my lower. Functioned flawlessly, After 200 rounds no fail to feed no jams functioned great. Looks great All of my buddies are jealous and are thinking about ordering one for themselves. A little expensive but well worth it. Highly recommend one you can’t go wrong. It is very accurate one moa at 100 yards. Love it
First-Timer –
This is a very sweet upper as always by CMMG. The craftsmanship and finish is amazing.Plan to send rounds down range this weekend!Can not go wrong with CMMG.