Proof Research Carbon Fiber AR-Style Barrel, .308 Win 20-Inch

The Proof Research AR-Style Barrel (brand part number 101292) is a 20-inch, .308 Winchester barrel built for AR-10-pattern rifles running a rifle-length gas system. Proof Research wraps this barrel in high-strength, aerospace-grade carbon fiber impregnated with a proprietary matrix resin, cutting weight by up to 64 percent compared to a traditional steel barrel of similar contour. That weight savings comes without sacrificing performance: the carbon-fiber wrap actually improves heat dissipation, helping the barrel run cooler and last longer under sustained strings of fire. Cut with a 1-in-10-inch twist and 5-groove rifling, and threaded 5/8-24 for a standard muzzle device, this barrel is built for precision shooters who want a lighter-swinging AR-10 without giving up accuracy.

Key Specifications

• Chambered in .308 Winchester/7.62 NATO.
• Barrel length is 20 inches.
• Sized for a rifle-length gas system.
• Rifling twist rate is 1-in-10 inches.
• Cut with 5-groove rifling.
• Threaded 5/8-24 tpi for a standard muzzle device.
• Wrapped in aerospace-grade carbon fiber with a proprietary matrix resin.
• Weighs up to 64% less than a traditional steel barrel of similar contour.
• Delivers improved heat dissipation for cooler, longer-lasting performance.

Frequently Asked Questions

How much lighter is this than a steel barrel? Up to 64% lighter than a traditional steel barrel of similar contour.

What gas system does this barrel use? A rifle-length gas system, sized for the 20-inch barrel length.

Is this barrel threaded? Yes, 5/8-24 tpi, ready for a standard .308-caliber muzzle device.

Buy the Proof Research Carbon Fiber AR-Style Barrel

Order the Proof Research .308 carbon fiber barrel from our Lubbock, Texas gun shop for fast, insured shipping. Browse more Proof Research AR-10 barrels for your build.