CMMG

The Mk4 3GR was developed for both the novice and the veteran 3-Gun shooter. The Mk4 3GR features an 18 416 stainless steel medium taper profile barrel CMMG's SV muzzle brake and RKM14 KeyMod hand guard. - Caliber: 5.56mm - Barrel: 18 medium weight taper profile - Muzzle: CMMG SV brake threaded 1/2-28 - Hand Guard: CMMG RKM14 KeyMod hand guard - Receiver: Forged 7075-T6 AL M4 type