Proof Research PXT Barrel Features The Proof Research PXT AR-15 Barrel introduces Proof Exponential Twist technology a complete rethinking of conventional rifling design and twist progression. By dramatically reducing rifling lead angle and smoothing projectile engagement into the bore PXT technology helps reduce wear improve consistency and lower felt torque during firing for improved recoil control. In controlled testing PXT barrels have demonstrated significant increases in barrel life while maintaining the accuracy standards Proof Research is known for. Chambered in .223 Wylde with a 1 in 7 inch twist the barrel is versatile enough to handle both 5.56 NATO and .223 Remington ammunition reliably. Built from Proof s signature carbon fiber construction the barrel keeps weight low on the front of the rifle while maintaining the strength and rigidity needed for consistent accuracy. A mid length gas system with a .750 inch gas journal and .082 inch port size is tuned for reliable cycling across a range of AR-15 configurations. The barrel is threaded 5/8-24 at the muzzle giving the shooter flexibility to add a muzzle device or suppressor. Arriving fully chambered at 14.5 inches and weighing just 1 pound 9 ounces the Proof Research PXT Barrel is an easy high performance upgrade for shooters refining their AR-15 build. Proof Research PXT Barrel Specifications Manufacturer: Proof Research Caliber: .223 Wylde Gun Platform: AR-15 Barrel Material: Carbon Fiber Barrel Type: Mid-Length Twist Rate: 1:7 Diameter: .750 Grooves: 5 Thread Pattern: 5/8x24 Barrel Length: 14.50 Weight: 1 lb 9 oz Available At: GrabAGun