CMMG Upper Group, Mk4 HT, 5.56mm
The Mk4 HT Upper Group features CMMG’s RKM11 KeyMod free float hand guard. Either a 416 stainless or nitrided 4140 CrMo steel barrels in a heavy taper profile are offered in 5.56mm and 300 BLK. The 22LR model is only available in the nitrided 4140 CrMo type barrel.
Features and Specifications:
Manufacturer Number: 55B9127
Barrel: 16.1", 1:7 twist, heavy taper, 416SS, Bead blasted finish
Muzzle: Thread protector, threaded 1/2-28
Hand Guard: CMMG RKM11 KeyMod hand guard
Receiver: Forged 7075-T6 AL M4 type