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    Order by 1PM CST for Same Day Shipping (Mon-Fri)

    The Mk4LE Optics Ready Upper Group is set up for your favorite scope or red dot sight as it has no front sight base to interfere with the sight picture.

    The Mk4LE OR comes with CMMG’s lifetime quality guarantee.

    • Caliber: 300 Blackout
    • Barrel: 16.1″, 1:7 twist, multi-role, 4140CM, SBN
    • Muzzle: A2 comp., threaded 5/8-24
    • Hand Guard: M4 type 2-piece hand guards
    • Receivers: 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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