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CMMG 55B2140 Upper Group, Mk4 A4, 5.56mm


CMMG 55B2140 Upper Group, Mk4 A4, 5.56mm

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.

SKU: 815835016788 Categories: ,
Caliber: 5.56mm
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)
Barrel Sub-Assembly
Hand Guard and Barrel Nut
Charging Handle
Bolt Carrier Group


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