CMMG Mk4 AR-15 HT Upper Receiver Group 5.56mm 55B785C

CMMG, Inc.
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CMMG Upper Group, Mk4 HT, 5.56mm, SBN

The Mk4 HT Upper Group features CMMGs RKM11 KeyMod free float hand guard. Either a 416 stainless or nitrided 4140 CrMo steel barrels in a heavy taper profile are offered in 5.56mm and 300 BLK. The 22LR model is only available in the nitrided 4140 CrMo type barrel.

Features and Specifications:
Manufacturer Number: 55B785C
Caliber: 5.56mm
Barrel: 16.1", 1:7 twist, heavy taper, 4140CM, SBN
Muzzle: Thread protector, threaded 1/2-28
Hand Guard: CMMG RKM11 KeyMod hand guard
Receiver: Forged 7075-T6 AL M4 type
Finish: Salt Bath Nitride (SBN)