The Proof Research .284 bore PXT Sendero carbon fiber barrel blank is a 16.5-inch bolt-action blank with a 1:8 twist (Proof Research part no. 151969). Proof Research wraps the blank in aerospace-grade carbon fiber, and PXT stands for PROOF Exponential Twist, a rifling geometry designed to reduce engraving force and throat erosion. The Sendero contour sets the blank’s profile, with a 1.20-inch shank diameter and a 2.5-inch breech length. This is a barrel blank, so it is unchambered and meant to be threaded and chambered by a gunsmith. At 16.5 inches it is a short length for a handy rifle.

Key Specifications

• The bore is .284 inch (7mm), the bore size of this blank.
• Barrel length is 16.5 inches, a short, handy length for a lightweight rifle.
• The twist rate is 1:8, one turn in 8 inches.
• The rifling is PXT (PROOF Exponential Twist), which Proof says smooths bullet engagement into the bore.
• The contour is Sendero, Proof’s name for this barrel profile.
• The shank diameter is 1.20 inches with a 2.5-inch breech length, for the gunsmith to work from.
• Weight is 2 pounds 6 ounces, and the construction is carbon fiber, which Proof says is up to 64 percent lighter than a steel barrel of similar contour.

Frequently Asked Questions

Is this barrel chambered? No. It is a barrel blank that is not chambered. A gunsmith needs to thread and chamber it before it can be used.

What does PXT mean? PXT stands for PROOF Exponential Twist, a rifling geometry Proof designed to reduce engraving force and throat erosion.

What twist rate does it have? This blank has a 1:8 twist.

Buy the Proof Research .284 Bore PXT Sendero Carbon Fiber Barrel Blank, 16.5-Inch, 1:8 Twist

For a lightweight 7mm build, a carbon fiber PXT blank gives a gunsmith a premium starting point. Order it from our Lubbock, Texas gun shop for fast, insured shipping, and see more rifle barrels for your project.