CMMG Mk4 A4 AR-15 Upper Assembly 5.56 NATO 20" Government Barrel 1:7 Twist Rifle Gas A2 Handguards Black 55B2140

Item No. ARR-118-032
  • In Stock
Our Low Price $699.97
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Brand: CMMG, Inc.
MFR #: 55B2140
UPC: 815835016788
Item #: ARR-118-032
Typically ships within 5 to 7 business days
CMMG AR-15 Upper Group, Mk4, A4, 5.56mm

The classic AR-15 Upper Group configuration, based on the M16A4, is available in both 5.56x45mm NATO. The 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, 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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