$796.95
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.
| PRODUCT SPECIFICATIONS | |
| 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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