When modularity, affordability, and quality are all important the Mk4 T is the upper group of choice. The Mk4 T upper group introduces CMMG’s RKM series of KeyMod free float hand guards. Either a 416 stainless or nitrided 4140 CrMo steel barrel in a medium taper profile are offered for both 5.56mm and 300 BLK. The 22LR and 9mm models feature a nitrided 4140 CrMo M4 profile barrel.
Barrel: 16.1″, 1:10 twist, M4 profile, 4140CM, SBN
Muzzle: A2 comp., threaded 1/2-36
Hand Guard: CMMG RKM11 KeyMod hand guard
Receiver: Forged 7075-T6 AL M4 type upper
Upper Group consists of: