CMMG

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 CMMGs 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