CMMG Mk4 K 300AAC Upper Group BLACK with two port compensator not flash hider.
NOTE: These do not come with a flash hidder but a SV Brake.
The Mk4 K Upper Group 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 Upper Group is covered by CMMGs lifetime quality guarantee.
Barrel: 12.5 medium weight multi-role profile
Muzzle: SV Brake, threaded 1/2-28
Hand Guard: CMMG RKM11 KeyMod hand guard
Receiver: 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)
Hand Guard and Barrel Nut
Bolt Carrier Group