The Mk4 T Upper Group introduces CMMG’s RKM series of KeyMod free float hand guards. The CMMG 55B59EC Mk4 T Upper Group has a 416 stainless steel barrel in a medium taper profile in a 5.56mm caliber format.
Barrel: 16″ medium weight taper profile*
Muzzle: A2 comp., threaded 1/2-28
Hand Guard: CMMG RKM11 KeyMod hand guard
Receiver: Forged 7075-T6 AL M4 type
|Upper Group consists of:
Upper Receiver Assembly (Upper Receiver, Ejection Port Cover, Forward Assist)
Hand Guard and Barrel Nut
Bolt Carrier Group
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