Upper Mk4 K 5.56mm

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Upper MK4 K 5.56mm 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 3 00 AAC Blackout. Each Upper Group is covered by CMMG?s lifetime quality guarantee. Description: Caliber: 5.56mm Barrel: 12.5? medium weight multi-role profile Muzzle: A2 comp., threaded 1/2-28 Hand Guard: CMMG RKM11 KeyMod hand guard Receiver: Forged 7075-T6 AL M4 type Show more