The Proof Research PXT Carbon Fiber Barrel Blank (brand part no. 157459) is a 20-inch, .243-bore bolt-action blank built around PXT — Proof Exponential Twist — a rethinking of conventional rifling geometry engineered to reduce engraving force, minimize throat erosion, and smooth the projectile’s transition into the bore. Proof Research reports 30-100% longer barrel life in controlled PXT testing while holding its established accuracy standards, and the carbon-fiber-wrapped construction delivers an exceptional stiffness-to-weight ratio at just 2 pounds 14 ounces in the Sendero contour. Among rifle barrels, this PXT blank favors custom builders and gunsmiths laying the foundation for a lightweight hunting or precision 6mm build.

Key Specifications

• The bore is .243 caliber (6mm).
• The blank measures 20 inches in the Sendero contour.
• The twist rate is 1:7.5, suited to heavy 6mm match and hunting bullets.
• Built with Proof’s carbon-fiber-wrapped construction for stiffness without weight.
• Rifled with PXT (Proof Exponential Twist) geometry that reduces engraving force and throat erosion.
• Proof reports 30-100% longer barrel life in controlled PXT testing.
• The breech measures 2.5 inches with a 1.20-inch shank diameter.
• The weight is 2 pounds 14 ounces.

Frequently Asked Questions

Is this a drop-in barrel? No, it is a pre-rifled, pre-contoured blank that a qualified gunsmith chambers and fits to your action.

What cartridges can it be chambered for? Any 6mm cartridge that fits the 20-inch Sendero blank and 1:7.5 twist, such as .243 Win or 6mm Creedmoor — your gunsmith cuts the chamber.

Buy the Proof Research PXT Barrel Blank

Longer barrel life and carbon-fiber stiffness in a gunsmith-ready 6mm blank are exactly what this PXT Sendero delivers. Order it from our Lubbock, Texas gun shop for fast shipping.