The Proof Research PXT Carbon Fiber Barrel Blank (brand part no. 154113) is an 18-inch, .224-bore Sendero-contour blank built around PROOF’s PXT — Exponential Twist — rifling geometry, engineered for custom rifle builders and gunsmiths who want a lightweight, high-durability foundation for a precision build. Proof Research reworks the conventional rifling lead angle and twist progression to reduce engraving force, minimize throat erosion, and smooth the bullet’s transition into the bore, and in controlled testing PXT barrels have shown a 30-100% increase in barrel life over standard rifling while holding PROOF’s usual accuracy standards. Built on PROOF’s proven carbon fiber construction, the blank keeps a favorable stiffness-to-weight ratio for lightweight hunting rifles, long-range precision rigs, and modern high-performance builds. Among rifle barrels, this blank favors builders chasing reduced recoil torque and extended barrel life without added weight.

Key Specifications

• Bore is cut to .224 caliber.
• Measures 18 inches in length.
• Rifled with a 1:8 twist rate.
• Cut in a Sendero contour.
• Uses PROOF’s PXT (Exponential Twist) rifling geometry.
• Built from carbon fiber over a steel liner for a lightweight, stiff barrel.
• Weighs approximately 2 pounds, 10 ounces.
• Barrel breech measures 2.5 inches.
• Shank diameter measures 1.20 inches.
• Demonstrated a 30-100% increase in barrel life in controlled testing versus conventional rifling.

Frequently Asked Questions

What is PXT rifling? PROOF Exponential Twist — a rifling geometry and twist progression designed to reduce engraving force, minimize throat erosion, and smooth bullet engagement for less felt torque and longer barrel life.

Is this a finished barrel or a blank? It’s a blank intended for custom rifle builders and gunsmiths to chamber and finish, not a drop-in finished barrel.

What rifles is this blank suited for? Lightweight hunting rifles, precision long-range builds, and modern high-performance rifle projects where reduced weight and extended barrel life matter.

Buy the Proof Research PXT Carbon Fiber Barrel Blank

Extended barrel life without added weight is exactly what this PXT carbon fiber blank delivers for a custom build. Order it from our Lubbock, Texas gun shop for fast, insured shipping.