The Ballistic Advantage Premium Series barrels are machined from 416R stainless steel and have a recessed 11-degree target crown. With a uniform bead blasted finish, these barrels are made specifically for the discerning marksman. Every Ballistic Advantage barrel is guaranteed to give sub Minute of Angle accuracy with match grade ammunition.Note: This heavy barrel requires a .875" gas block.Features: 20" 6.5 Creedmoor 1:8 Twist Rate Rifle Length Gas System 5/8x24 ThreadedThis 20" Heavy contour barrel matches DPMS pattern bolts and features a gently tapered profile that helps improve the balance of the completed rifle. Chambered for 6.5 Creedmoor, Magnetic Particle Inspected, and proof fired, this barrel is what you want if you are looking to maximize the accuracy of your large frame AR. Using the same standard .308 components with this new barrel allows you to take advantage of the inherent accuracy of the 6.5 mm bullet with 33% less felt recoil, improved ballistics, and better energy retention past 300 yards.