CMMG Upper Group, Mk4 S, 5.56mm
The Mk4 S Upper Group utilizes an 18" 416 stainless steel medium taper barrel chambered in 5.56x45mm NATO and CMMG’s RKM14 KeyMod hand guard. The upper group’s KeyMod hand guard is ready to accept any number of the sling mounts, bi-pods and other KeyMod compatible accessories making the ultimate in versatility and modularity. Each upper is covered by CMMG’s lifetime quality guarantee.
Features and Specifications:
Manufacturer Number: 55B6622
Caliber: 5.56mm
Barrel: 18" medium weight taper profile
Muzzle: A2 comp., threaded 1/2-28
Hand Guard: CMMG RKM14 KeyMod hand guard
Receiver: Forged 7075-T6 AL M4 type upper
The Mk4 S Upper Group utilizes an 18" 416 stainless steel medium taper barrel chambered in 5.56x45mm NATO and CMMG’s RKM14 KeyMod hand guard. The upper group’s KeyMod hand guard is ready to accept any number of the sling mounts, bi-pods and other KeyMod compatible accessories making the ultimate in versatility and modularity. Each upper is covered by CMMG’s lifetime quality guarantee.
Features and Specifications:
Manufacturer Number: 55B6622
Caliber: 5.56mm
Barrel: 18" medium weight taper profile
Muzzle: A2 comp., threaded 1/2-28
Hand Guard: CMMG RKM14 KeyMod hand guard
Receiver: Forged 7075-T6 AL M4 type upper