Proof Research PR15 PXT Carbon Fiber AR Barrel Features The Proof Research PXT rifling geometry is a complete rethink of conventional twist progression reducing engraving force and the rifling lead angle so the bullet engages the bore more smoothly. That smoother engagement lowers felt torque during firing which helps the shooter stay on target through recoil while also reducing throat erosion over the barrel s service life. Chambered in .223 Wylde this barrel is optimized to shoot both 5.56 NATO and .223 Remington ammunition accurately giving builders flexibility in ammo selection. The 1 in 7 twist rate stabilizes a wide range of bullet weights from lightweight varmint loads up to heavier match projectiles. Built with a carbon fiber wrapped barrel the PR15 PXT sheds significant weight compared to a traditional steel barrel without sacrificing the rigidity needed for accuracy. The mid length gas system and .750 gas journal keep the barrel compatible with standard AR-15 handguards and gas blocks simplifying installation into an existing build. A 5/8x24 threaded muzzle is ready for a brake compensator or suppressor mount right out of the box. Arriving fully chambered and finished this barrel gives shooters a straightforward path to next generation performance in a proven PROOF Research package. Proof Research PR15 PXT Carbon Fiber AR Barrel Specifications Manufacturer: Proof Research Model: PR15 PXT Carbon Fiber AR Caliber: .223 Wylde Barrel Length: 16 Twist Rate: 1-in-7 Thread Pattern: 5/8x24 Gas System Length: Mid Gas Journal: .750 Port Size: .082 Material: Carbon Fiber / Stainless Steel Weight: 1 lb. 12 oz. Available At: GrabAGun