Proof Research Carbon Fiber Barrel for AR-10/LR-308 - .308 Winchester, 1:10 Twist

The Proof Research Carbon Fiber Barrel for AR-10/LR-308 in .308 Winchester with 1:10 twist rate brings next-level performance to your long-range rifle platform. Built with carbon fiber wrapping technology, this barrel sheds unnecessary weight while gaining structural rigidity that traditional steel simply can't match. If you're running a precision AR-10 for hunting, competition, or distance shooting, a carbon fiber wrapped barrel cuts down fatigue during long days afield or at the range—all without sacrificing the accuracy and durability that matter when rounds downrange count.

Proof Research's carbon fiber construction delivers real engineering advantages. The composite wrap dissipates heat more efficiently than steel, keeping barrel temperatures lower during extended shooting sessions and extending barrel life. This thermal management also means minimal point-of-impact drift even when you're pushing volume through your rifle. The reduced harmonic vibration inherent to carbon fiber design translates directly to tighter groups and more consistent performance shot to shot.

This is a .308 Winchester barrel designed for AR-10/LR-308 platforms and compatible with standard .875" gas blocks. The 1:10 twist rate is a proven match for the full range of .308 Winchester ammunition from lightweight target loads to heavy magnum-class rounds. Note that the barrel itself ships without gas block, gas tube, or bolt—you'll need to source or transfer those components from your build.

Key Features

• Carbon fiber wrap construction—up to 30% lighter than equivalent-weight steel barrels
• 300% stiffer than comparable steel, reducing harmonic vibration for improved accuracy
• Superior heat dissipation keeps barrel cooler during high-volume fire
• No point-of-impact shift during extended shooting sessions
• Weather-resistant composite resists nicks, dings, and scratches
• 1:10 twist rate for .308 Winchester across the velocity spectrum
• Compatible with standard .875" AR-10 gas blocks

Specifications

Frequently Asked Questions

What gas block size does this .308 barrel require?

This .308 Winchester barrel is designed for .875" gas blocks, which is the standard for AR-10 platforms.

Will this barrel fit my AR-10 or LR-308 rifle?

Yes, this barrel is manufactured for AR-10 and LR-308 platforms. Confirm your receiver's barrel extension compatibility and that you have or can source the appropriate gas block, gas tube, and bolt separately.

What's not included with this barrel?

The barrel ships without a gas block, gas tube, or bolt. You'll need to source or transfer these components from an existing upper or purchase them separately.

Is the 1:10 twist good for standard .308 Winchester ammunition?

Yes, the 1:10 twist is a versatile rate for .308 Winchester and will stabilize the full range of factory and handloaded ammunition in that caliber, from light target rounds to heavy magnum loads.