Proof Research PXT carbon fiber barrel blanks give custom rifle builders and gunsmiths a premium starting point for a lightweight, high-performance rifle. This .243 caliber blank measures 16.50", and the carbon fiber construction delivers a high stiffness-to-weight ratio that trims overall rifle weight without giving up accuracy.

PXT is Proof's Exponential Twist rifling, a rework of conventional rifling geometry and twist progression that lowers engraving force, reduces throat erosion and eases the bullet's entry into the rifling. The reduced rifling lead angle also cuts wear and felt torque during firing, and Proof reports a 30-100% increase in barrel life for PXT barrels in controlled testing while holding its accuracy standards. The .243 bore suits a long list of 6mm chamberings, from .243 WIN to 6MM Creedmoor, leaving the chambering and finish work to the builder. The Sendero contour gives a stiff profile suited to lightweight hunting rifles and precision long-range builds.

• Brand: Proof Research
• Model: PXT Barrel Blank
• Caliber: .243
• Barrel Length: 16.50"
• Twist Rate: 1:7.5
• Contour: Sendero
• Construction: Carbon Fiber, PXT Rifling