The CMMG 30B8A67 Upper Group, Mk4 K, 300 BLK includes the RKM11 KeyMod free floating hand guard. The barrel is a nitrided 4140 CrMo steel 12.5″ barrel available in both 5.56x45mm and 300 AAC Blackout. Each CMMG 30B8A67 Upper Group, Mk4 K, 300 BLK is covered by CMMG’s lifetime quality guarantee.
|Caliber: 300 Blackout
Barrel: 12.5″, 1:7 twist, Multi-role profile, 4140CM, SBN
Muzzle: A2 comp., threaded 5/8-24
Hand Guard: CMMG RKM11 KeyMod hand guard
Receiver: Forged 7075-T6 AL M4 type upper
Gas Port Location: Pistol
|Upper Group consists of:
Upper Receiver Assembly (Upper Receiver, Ejection Port Cover, Forward Assist)
Hand Guard and Barrel Nut
Bolt Carrier Group
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