Ballistic Advantage Premium Series 16 SPR 6mm ARC Barrel, Mid Length. Manufactured from 416R Stainless steel with a bead blasted finish, this 6mm ARC caliber barrel is perfect to finish your latest AR-15 workshop project. This Premium Series barrel features a 16 length, a 1:7 twist rate, 5/8 x 24 TPI, and a .750 Mid-Length gas system. Offering premium statistics for a competition or show-off build as well as providing quality operating performance from your rifle, this barrel will keep you ahead of the competition.Features: 16 Length 416R Stainless Steel SPR Profile Bead Blasted Finish 1:7 Twist Rate Mid-Length Gas System .750 Gas Block Journal 5/8 x 24 TPI 39.3 oz. WeightManufacturer: Ballistic AdvantagePRODUCT SPECIFICATIONS: Barrel Length: 16 Barrel Thread Pitch: 5/8 x 24 TPI Brand: Ballistic Advantage Caliber: 6mm ARC Finish / Color: Stainless Steel Firearm Type: Rifle Material: Steel Models Fit: AR-15