The Proof Research Proof 139004 Bolt 284 18 8tw carbon fiber barrel blank is built for shooters who want a lighter rifle without giving up stiffness or consistency. Using a match-grade 416r stainless steel core wrapped in aerospace-grade carbon fiber with a sendero contour, this 18 inch, 1:8 twist .284 Winchester barrel is engineered to deliver repeatable accuracy while keeping weight to a minimum.

This blank arrives unthreaded and unchambered so a qualified gunsmith can cut it specifically for your action and preferred chamber. The 1:8 twist rate is optimized for modern heavy-for-caliber 7mm bullets, making it a strong choice for precision-focused hunting or long-range target work where a compact, easy-handling rifle is preferred. Proof Research is known for meticulous quality control and carefully lapped bores, giving builders a refined starting point for a custom rifle.

Key Features:

• Manufacturer: Proof Research
• Model: 139004 Bolt 284 18 8tw
• Caliber: .284 Winchester
• Barrel Length: 18 Inches
• Twist Rate: 1:8
• Barrel Type: Carbon Fiber Sendero Contour Blank
• Configuration: Unthreaded, Unchambered
• Construction: 416r Stainless Steel Core With Carbon Fiber Wrap
• Weight: 2 Pounds 8 Ounces