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This 300 BLK Mk4 T Upper Group introduces CMMG’s RKM series of KeyMod free float hand guards. It features a nitrided 4140 CrMo steel barrel in a medium taper profile.
- Caliber: 300 Blackout
- Barrel: 16.1″, 1:7 twist, medium taper, 4140CM, SBN
- Muzzle: A2 comp., threaded 5/8-24
- Hand Guard: CMMG RKM11 KeyMod hand guard
- Receiver: Forged 7075-T6 AL M4 type upper
- Gas Port Location: Carbine
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