The Proof Research PXT Carbon Fiber Barrel Blank (brand part no. 154243) gives custom rifle builders a premium .30-caliber foundation combining Proof’s proven carbon fiber construction with PXT — Proof Exponential Twist — rifling. Proof Research engineered PXT as a complete rethinking of conventional rifling geometry: by dramatically reducing rifling lead angle and smoothing projectile engagement, the design reduces engraving force, minimizes throat erosion, and produces less felt torque during firing. In controlled testing, PXT barrels demonstrated a 30 to 100 percent increase in barrel life while holding Proof’s accuracy standards. This blank wears a 20-inch Sendero contour at just 2 pounds 11 ounces. Among rifle barrels, this blank favors gunsmiths building lightweight precision bolt guns.

Key Specifications

• The bore is .30 caliber (.308), supplied as an unchambered blank for gunsmith fitting.
• The length is 20 inches in a Sendero contour.
• The rifling is PXT exponential twist finishing at 1:10.
• The construction is carbon fiber wrapped for an exceptional stiffness-to-weight ratio.
• The breech section measures 2.5 inches with a 1.20-inch shank diameter.
• The weight is 2 pounds 11 ounces.
• PXT testing showed a 30-100 percent increase in barrel life over conventional rifling.

Frequently Asked Questions

Is this barrel ready to install? No — it is a blank intended for custom rifle builders and gunsmiths, requiring chambering and fitting to the action.

What does PXT rifling change? The exponential twist progression smooths the bullet’s engagement with the rifling, reducing throat erosion, engraving force, and felt torque while extending barrel life.

Buy the Proof Research PXT Barrel Blank

A featherweight, long-wearing foundation for a custom precision build is exactly what this PXT blank delivers. Order it from our Lubbock, Texas gun shop and it ships fast to your door.