CMMG 55B66C7 Upper Group, Mk4 3GR, 5.56mm

MSRP : $849.95

CMMG 55B66C7 Upper Group, Mk4 3GR, 5.56mm

The CMMG 55B66C7 Mk4 3GR Upper Group features an 18″ 416 stainless steel medium taper profile 5.56x45mm barrel. This Upper Group is equipped with CMMG’s SV muzzle brake and RKM14 KeyMod hand guard.

SKU: 815835016634 Categories: ,
Caliber: 5.56mm
Barrel: 18″ medium weight taper profile
Muzzle: CMMG SV brake, threaded 1/2-28
Hand Guard: CMMG RKM14 KeyMod hand guard
Receiver: Forged 7075-T6 AL M4 type
Upper Group consists of:
Upper Receiver Assembly (Upper Receiver, Ejection Port Cover, Forward Assist)
Barrel Sub-Assembly
Hand Guard and Barrel Nut
Charging Handle
Bolt Carrier Group


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