The Proof Research PXT carbon fiber barrel blank in .308 is an 18-inch bolt-action blank for builders who want a lightweight, long-lived barrel (Proof Research part no. 154229). PXT is Proof Research’s exponential twist rifling, which starts the twist very gradually at the breech to soften bullet engagement and reduce throat wear. The blank has a Sendero contour and weighs 2 pounds 8 ounces. As a blank, it is meant for a gunsmith to chamber and fit to a rifle. Proof describes its bolt-action blanks as designed for custom rifle builders and gunsmiths.

Key Specifications

• The barrel is a .308 caliber blank.
• Length is 18 inches.
• The twist is 1:10 PXT, Proof Research’s exponential twist rifling.
• The contour is Sendero.
• The shank diameter is 1.20 inches with a 2.5-inch breech length.
• It weighs 2 pounds 8 ounces.
• The barrel is carbon fiber wrapped, which Proof says cuts weight by up to 64 percent against a steel barrel of similar contour.

Frequently Asked Questions

Is this barrel chambered? No. It is a barrel blank, so a gunsmith needs to chamber and fit it to your action.

What does PXT mean? PXT is Proof Research’s exponential twist rifling, which begins with a very gradual twist and speeds up toward the muzzle to ease bullet engagement and reduce throat wear.

What are the main dimensions? It is 18 inches long with a 1:10 twist, a Sendero contour, a 1.20-inch shank and a 2.5-inch breech length.

Buy the Proof Research PXT Carbon Fiber Barrel Blank, .308, 18-Inch

A carbon-wrapped PXT blank is for a build where weight and barrel life both matter. It is made by Proof Research, and you can browse similar parts in our rifle barrels section. Order from our Lubbock, Texas gun shop for fast, insured shipping.