CMMG 55B2140 Upper Group, Mk4 A4, 5.56mm
February 18, 2018
CMMG 30B2C4E Upper Group, Mk4 HT, 300 BLK
February 18, 2018
CMMG 30B442D Upper Group, Mk4 HT, 300 BLK, SBN
$696.95
CMMG 30B442D Upper Group, Mk4 HT, 300 BLK, SBN
The CMMG 30B442D Upper Group, Mk4 HT, 300 BLK, SBN features CMMG’s RKM11 KeyMod free float hand guard. The CMMG 30B442D Upper Group, Mk4 HT, 300 BLK, SBN has a nitrided 4140 CrMo steel barrel in a heavy taper profile in a 300 Blackout format.
| PRODUCT SPECIFICATIONS | |
| Caliber: 300 Blackout Barrel: 16.1″, 1:7 twist, heavy taper, 4140CM, SBN Muzzle: thread protector, threaded 5/8-24 Hand Guard: CMMG RKM11 KeyMod hand guard Upper Rcvr: Forged 7075-T6 AL M4 type upper Gas Port Location: Carbine |
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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