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CMMG Mk4 A4 Upper Group 5.56mm 55B2140

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CMMG, Inc.
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CMMG Upper Group, Mk4, A4, 5.56mm

The classic AR15 Upper Group configuration, based on the M16A4, is available in both 5.56x45mm NATO. The Mk4 A4 Upper Groups defining characteristic is its 20" government profile barrel. The 5.56mm barrel is chrome-lined and built to the militarys stringent specifications, while the 22LR features a premium 4140 CrMo steel barrel with a nitride finish for years of accurate shooting and reliable performance.

Features and Specifications:
Manufacturer Number: 55B2140
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
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