Proof Research PR-15 PXT Barrel 6mm ARC 18" Stainless Steel 1:7.5 Twist

The Proof Research PR-15 PXT barrel is engineered for AR-15 platform rifles chambered in 6mm ARC, featuring an 18-inch stainless steel contour with a 1:7.5 twist rate. PXT (PROOF Exponential Twist) technology represents a new evolution in barrel design, combining advanced rifling geometry with progressive twist progression to reduce engraving force, minimize throat erosion, and maximize precision. Designed as a drop-in compatible replacement barrel for AR-15/M4-pattern rifles.