The CMMG 55B785C Upper Group Mk4 HT, 5.56mm, SBN features CMMG’s RKM11 KeyMod free float hand guard. The CMMG 55B785C Upper Group Mk4 HT, 5.56mm, SBN has a nitrided 4140 CrMo steel barrel in a heavy taper profile in a 5.56mm format.
Barrel: 16.1″, 1:7 twist, heavy taper, 4140CM, SBN
Muzzle: Thread protector, threaded 1/2-28
Hand Guard: CMMG RKM11 KeyMod hand guard
Receiver: Forged 7075-T6 AL M4 type
|Upper Group consists of:
Upper Receiver Assembly (Upper Receiver, Ejection Port Cover, Forward Assist)
Hand Guard and Barrel Nut
Bolt Carrier Group
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