The PROOF Research PXT Carbon Fiber Sendero Barrel Blank in .284 bore, 18 inches (PROOF part no. 151976) is an unchambered barrel blank built by PROOF Research for custom rifle builders and gunsmiths. It pairs PROOF’s carbon-fiber-wrapped, match-grade steel core construction with PXT — PROOF Exponential Twist — rifling geometry, a rethinking of conventional twist progression designed to reduce engraving force and smooth the bullet’s transition into the rifling. In controlled testing, PXT barrels have shown a 30-100% increase in barrel life over conventional rifling while holding to PROOF’s usual accuracy standards. Because it ships as a blank, it is intended for a gunsmith to chamber and fit to a specific action, making it a premium foundation for a lightweight, long-range precision build.

Key Specifications

• Bored for .284-caliber projectiles, ready for a gunsmith to chamber to the builder’s cartridge of choice.
• Measures 18 inches in length, suited to a compact, lightweight precision rifle build.
• Rifled with PXT (PROOF Exponential Twist) geometry to reduce throat erosion and extend barrel life.
• Wrapped in carbon fiber over a match-grade steel core for a superior stiffness-to-weight ratio.
• Machined in a Sendero contour that balances rigidity with reduced overall weight.
• Finished with a 2.5-inch breech and 1.20-inch shank diameter for standard custom-action fitment.
• Weighs approximately 2 lbs 8 oz, dramatically lighter than a comparable steel barrel blank.

Frequently Asked Questions

Does this barrel come chambered and ready to install? No, it ships as an unchambered blank for a gunsmith to chamber and fit to your action.

What makes PXT rifling different? PROOF re-engineered the rifling lead angle and twist progression to reduce wear, with testing showing up to a 100% increase in barrel life.

Why choose a carbon fiber barrel blank? The carbon wrap sheds significant weight versus steel while adding stiffness, ideal for lightweight precision and hunting rifle builds.

Buy the PROOF Research PXT Carbon Fiber Sendero Barrel Blank

Build your next precision rifle around a barrel engineered to outlast the competition. Order this PROOF Research blank from our rifle barrels selection for fast, insured shipping from our Lubbock, Texas gun shop.