This Proof Research bolt-action barrel blank is a 20-inch, 7mm (.284) bore carbon fiber blank with a 1:8 PXT twist and a Sendero contour. It is an unfitted blank for custom rifle builders and gunsmiths to chamber, thread and fit to an action. PXT is Proof Exponential Twist rifling, which starts at a very slow twist at the throat and tightens progressively to the nominal rate at the muzzle; Proof states this lowers bullet engraving force and extends barrel life. The barrel has a steel core wrapped in aerospace-grade carbon fiber, which Proof says makes it up to 64% lighter than a steel barrel of similar contour.
- Manufacturer Part # : 152003
- Type : Bolt-Action Barrel Blank
- Bore : 7mm (.284)
- Length : 20"
- Rifling : PXT (Proof Exponential Twist)
- Contour : Sendero
- Breech Length : 2.5"
- Shank Diameter : 1.20"
- Material : Carbon Fiber Wrapped Steel
- Fitting : Requires gunsmith chambering and fitting
- Weight : 2 lb 12 oz
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