Proof Research Sendero Carbon Fiber PXT Barrel Blank Features The Proof Research Sendero carbon fiber barrel blank is built around PXT Proof Exponential Twist rifling which dramatically reduces rifling lead angle and smooths projectile engagement into the bore compared to conventional rifling geometry. That smoother engagement reduces engraving force and throat erosion extending barrel life by 30 to 100 percent in controlled testing while holding to the accuracy standards Proof barrels are known for. Less felt torque during firing also means improved recoil control helping the shooter stay on target more effectively for faster follow-up shots. Chambered for .308 Win with a 1:10 twist rate and 5 grooves this blank is matched to a wide range of popular .308 Win projectile weights. Built around Proof s proven carbon fiber construction the Sendero blank delivers an exceptional stiffness-to-weight ratio trimming overall rifle weight without sacrificing barrel rigidity or accuracy. At 16.5 inches long with a 2.5 inch breech and a 1.20 inch shank diameter the blank is sized for custom rifle builders and gunsmiths assembling lightweight hunting rifles or precision long-range systems. The stainless steel finish gives the blank corrosion resistance appropriate for field and long-range use in varied weather conditions. Weighing in at roughly 2 pounds 13 ounces this Sendero blank offers a premium foundation for a modern high-performance bolt action rifle build. Proof Research Sendero Carbon Fiber PXT Barrel Blank Specifications Manufacturer: Proof Research Model: Sendero Carbon Fiber PXT Barrel Blank Caliber: .308 Win Action: Bolt Barrel Material: Carbon Fiber Twist Rate: 1:10 Grooves: 5 Color: Stainless Finish: Stainless Steel Barrel Length: 16.5 Weight: 2 lbs. 13 oz. Available At: GrabAGun