CMMG

The Mk4 K is CMMG's primary short barreled rifle. The Mk4 K 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 rifle includes Magpul MOE pistol grip and trigger guard along with a magazine and CMMG's lifetime quality guarantee. - 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 - Receivers: Forged 7075-T6 AL M4 type upper - Trigger: Single stage mil-spec style trigger - Weight: 6 lbs (unloaded) - Length: 29 (stock collapsed) - Gas Port Location: Carbine