The Proof Research PR10 Direct Impingement Barrel (brand part number 100646) is a gas-operated barrel built for direct impingement AR-10 rifles, chambered in 6.5 Creedmoor with a 22-inch barrel and gas tube length. Machined by Proof Research from stainless steel in a heavy contour with a .875-inch gas journal, this barrel is threaded 5/8×24 for standard .30-caliber-class muzzle devices and gives AR-10 builders a genuine gas-gun option rather than a bolt-action retrofit.

Key Specifications

• Chambered in 6.5 Creedmoor for flat-shooting, long-range performance.
• Barrel and gas tube length is 22 inches.
• Twist rate is 1:8, matched to common 6.5 Creedmoor bullet weights.
• Contour is heavy with a .875-inch gas journal diameter.
• Threaded 5/8×24 for standard muzzle devices.
• Built for direct impingement AR-10 pattern rifles.
• Constructed from stainless steel for corrosion resistance and durability.
• Sold as a bare barrel component, not a complete upper assembly.
• Correct headspacing on a gas-operated AR-10 typically calls for professional installation.

Frequently Asked Questions

Is this the same barrel as the standard PR10? No, this DI variant is built specifically for direct impingement gas systems rather than the standard PR10 gas length.

Does this require gunsmith installation? Fitting a gas-operated AR-10 barrel typically requires proper headspacing and gas system alignment; professional installation is recommended.

Buy the Proof Research PR10 DI 6.5 Creedmoor Barrel

Build a direct-impingement AR-10 around a genuine Proof Research gas gun barrel. Order this AR-10 barrel from our Lubbock, Texas gun shop for fast, insured shipping to your door.