Proof Research PR-15 PXT Barrel 6mm ARC 16" Stainless Steel 1:7.5 Twist

The Proof Research PR-15 PXT barrel in 6mm ARC features the company's proprietary PXT (PROOF Exponential Twist) rifling technology — a complete rethinking of conventional rifling design. PXT's progressive twist geometry is engineered to reduce engraving force, minimize throat erosion, and maximize precision and barrel life. This 16-inch stainless steel barrel is designed for AR-15 platform rifles chambered in 6mm ARC, with a 1:7.5 twist rate optimized for stabilizing the cartridge's projectile range.