The 6mm ARC was designed by Hornady to be the highest performance long-range cartridge available in a standard AR platform rifle. Initially tested and fielded by US Special Operations forces, the 6mm ARC utilizes efficient, high-BC bullets to deliver unprecedented long-range performance with a wide variety of available bullets. Commercial 6mm ARC loads feature bullets selected to deliver ideal performance for hunting, match shooting, and personal protection applications. The 6mm ARC uses commonly available 6.5 Grendel magazines/bolts. Wilson Combat offers WC-15 6mm ARC rifles with their match-grade, 18" fluted/threaded Tactical Hunter barrel. All barrels will be rifled with a 1-7.5" twist. SPECIFICATIONS Lightweight Billet Upper (Flat Top) and Billet Lower Receiver Wilson Combat Tactical Hunter Match Grade Barrel Mid Length Gas System with Lo-Profile Gas Block 5/8"x24 Threaded Muzzle with Thread Protector Wilson Combat 12.6" M-LOK Rail with Three Wilson Combat Rail Covers Wilson Combat/BCM Starburst Gunfighter Grip, Black Rogers/Wilson Super-Stoc Wilson Combat TTU (Tactical Trigger Unit) M2, 4# Premium Bolt Carrier Assembly Armor-TuffA(R) Finish applied over Mil-Spec Hard Anodized Upper/Lower Receivers Caliber: 6mm ARC Barrel Length: 18" Fluted Threaded Overall Length: 33.5" Weight Empty: 6 lbs 14 oz