The Proof Research PR15 (brand part no. 130438) is a carbon fiber-wrapped, AR-style barrel chambered in 6mm ARC, combining a steel rifled core with a carbon fiber sleeve to cut weight versus an equivalent steel barrel.

Key Specifications

• Chambered in 6mm ARC
• 20-inch barrel length
• 1-in-7.5 twist rate
• Carbon fiber-wrapped, AR-style barrel construction over a 416R stainless steel core
• 5/8×24 muzzle threads
• Approximately 50% lighter than a comparable steel bull-contour barrel
• Cut-rifled, lapped, and borescope-inspected for consistency

Frequently Asked Questions

Why choose a carbon fiber barrel over steel? Carbon fiber-wrapped barrels like this PR15 are built to cut weight versus an equivalent steel barrel while retaining a rifled steel core.

What twist rate does it use? 1-in-7.5, suited to a range of 6mm ARC bullet weights.

How much lighter is it than a steel barrel? Proof Research states it’s about 50% lighter than a comparable steel bull-contour barrel.

Buy the Proof Research PR15 Carbon Fiber Barrel, 6ARC, 20in

Order this barrel from our Proof Research lineup, browsable in our full rifle parts selection, with fast, insured shipping from our Lubbock, Texas gun shop.