Proof Research AR-15 Barrel Features The Proof Research AR-15 Barrel brings PXT Proof Exponential Twist rifling technology to a traditional steel barrel chambered in 6mm ARC. By dramatically reducing rifling lead angle and smoothing projectile engagement into the bore PXT reduces engraving force and minimizes throat erosion compared to conventional rifling geometry. This translates into less felt torque during firing giving shooters improved recoil control and the ability to stay on target more effectively between shots. In controlled testing PXT barrels have demonstrated significant increases in barrel life while maintaining the accuracy standards Proof Research barrels are known for. This 16 inch barrel features a 1:7.5 twist rate matched to 6mm ARC bullet weights and a 0.750 inch gas journal sized for a rifle length gas system. The 5/8x24 threaded muzzle comes fully chambered and ready for installation making it a straightforward upgrade for builders looking to refine an existing AR-15 platform. Finished in stainless steel the barrel offers corrosion resistance alongside the accuracy gains of the PXT rifling design. For AR-15 builders and precision shooters chasing better consistency and barrel longevity in 6mm ARC the Proof Research AR-15 Barrel is available for sale at GrabAGun. Proof Research AR-15 Barrel Specifications Manufacturer: Proof Research Model: AR-15 Barrel Caliber: 6mm ARC Barrel Length: 16 Barrel Material: Steel Barrel Finish: Stainless Twist Rate: 1:7.5 Gas System: Rifle Length Diameter: .750 Grooves: 5 Thread Pattern: 5/8x24 Weight: 1 lb. 12 oz. Available At: GrabAGun