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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

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