The Proof Research PR10 Carbon Fiber Barrel in .308 Win, 16 inches (brand part no. 101261), pairs a carbon-fiber-wrapped profile with a direct-impingement gas system sized for AR-10-pattern rifles. Proof builds the PR10 series around a 5/8×24 threaded muzzle and a .750-inch gas journal diameter, running an intermediate-length gas system tuned for reliable cycling at this barrel length. A 1:10 twist rate stabilizes the full range of common .308 Winchester bullet weights, and at roughly 2 pounds 3 ounces, the carbon fiber wrap sheds significant weight compared to a steel barrel of the same contour. It is built for AR-10 owners who want a lighter-swinging rifle without giving up accuracy.

Key Specifications

• Chambered in .308 Winchester.
• Measures 16 inches long.
• Cut with a 1:10 twist rate.
• Uses an intermediate-length direct-impingement gas system.
• Gas journal diameter of .750 inches.
• Threaded 5/8×24 at the muzzle.
• Weighs approximately 2 pounds 3 ounces, thanks to Proof’s carbon fiber wrap.
• Constructed with Proof’s carbon-fiber-wrapped barrel technology for reduced weight.
• Part of Proof’s AR-Style Barrel line.

Frequently Asked Questions

What gas system does this barrel use? An intermediate-length direct-impingement system with a .750-inch gas journal diameter.

Why choose a carbon fiber barrel? Proof’s carbon fiber wrap sheds significant weight compared to a steel barrel of the same contour, at roughly 2 pounds 3 ounces for this 16-inch PR10.

What muzzle thread does it use? 5/8×24, compatible with common .30-caliber brakes and suppressors.

Buy the Proof Research PR10 Carbon Fiber Barrel

Lighten up your AR-10 without losing accuracy with this Proof Research barrel, part of our full AR-10 barrels lineup. Order it from our Lubbock, Texas gun shop for fast, insured shipping.