Proof Research PR15 PXT Carbon Fiber AR Barrel Features The Proof Research PR15 PXT Carbon Fiber Barrel uses PROOF s carbon fiber wrapped technology to dramatically reduce weight compared to a traditional steel barrel of the same length and profile. Chambered in .223 Wylde the barrel offers the ability to safely and accurately fire both .223 Remington and 5.56 NATO ammunition from the same rifle. A 1:7 twist rate stabilizes a broad range of bullet weights from lightweight varmint loads up through heavier match and defensive projectiles. At 18 inches the barrel strikes a balance between a compact carbine-length setup and the added velocity and accuracy potential of a longer rifle-length barrel. The threaded 5/8x24 muzzle accepts a wide range of muzzle brakes compensators or suppressors giving shooters flexibility to configure the rifle for competition hunting or home defense roles. A stainless steel finish provides corrosion resistance and a clean durable appearance that holds up to repeated range use. At just 1 pound 12 ounces swapping to this carbon fiber barrel can meaningfully reduce the front-heavy feel of an AR-15 improving handling during offhand and rapid-transition shooting. The Proof Research PR15 PXT Carbon Fiber Barrel is a proven weight-saving upgrade for sale at GrabAGun for AR-15 builders and owners. Proof Research PR15 PXT Carbon Fiber AR Barrel Specifications Manufacturer: Proof Research Model: PR15 PXT Carbon Fiber AR Barrel Type: AR Barrel Caliber: .223 Wylde Barrel Length: 18 Twist: 1:7 Finish: Carbon Fiber Thread Pattern: 5/8x24 Weight: 1 lb 12 oz Available At: GrabAGun