This brand new CMMG MK4 (60A8653) is a semi-automatic rifle which fires the 6mm ARC round. It has a 20" barrel and matte black finish. This includes 1 10-round magazine, free float M-lok rail, box and manual.
Further information from distribution website: CALIBER: 6mm ARC BARREL: 20", 1:7.5 twist, 6.5mm ARC, MT 416SS, SBN MUZZLE: A2 Comp, threaded 5/8-24 GAS PORT LOCATION: Rifle Length RECEIVER: Forged 7075-T6 AL M4 type upper, AR15 type lower HAND GUARD: CMMG RML15 M-Lok hand guard FINISH: Hard Coat Anodized Receivers and Hand Guard CHARGING HANDLE: CMMG Mil-Spec PISTOL GRIP: CMMG A2 BUTT STOCK: CMMG A1 Fixed Stock TRIGGER: CMMG Single Stage Mil-Spec Style Trigger TRIGGER GUARD: CMMG Mil-Spec SAFETY SELECTOR: CMMG Mil-Spec MAGAZINE: 10rd WEIGHT: 7lbs 10oz(unloaded) LENGTH: 38.9"