The classic AR15 Upper Group configuration, based on the M16A4. The CMMG 55B2140 Mk4 A4 Upper Group’s defining characteristic is its 20″ government profile barrel. The 5.56mm barrel is chrome-lined and built to the military’s stringent specifications.
Barrel: 20″, 1:7 twist, government profile, 4150CMV CL, phosphate finish
Muzzle: A2 compensator, threaded 1/2-28
Hand Guard: Rifle length 2 piece hand guards
Receivers: Forged 7075-T6 AL M4 type upper
Gas Port Location: Rifle
|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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