The Proof Research PR10 Barrel (brand part no. 100677) is an 18-inch stainless steel barrel chambered in .308 Winchester and built for the AR-10 platform, cut with a 1-in-10 twist rate. A rifle-length gas system and a .750-inch gas journal diameter make it a straightforward drop-in for standard AR-10 builds, and the muzzle is threaded 5/8-24 for compatibility with common muzzle devices. At roughly 3 pounds 1 ounce, it keeps weight reasonable for a stainless precision barrel of this length. Proof Research barrels are built for shooters who want match-grade accuracy without the added weight and cost of a full carbon-fiber-wrapped barrel.

Key Specifications

• Chambered in .308 Winchester for the AR-10 platform.
• 18-inch stainless steel barrel length.
• 1-in-10 twist rate for stabilizing common .308 bullet weights.
• Rifle-length gas system with a .750-inch gas journal diameter.
• Muzzle threaded 5/8-24 for standard muzzle device compatibility.
• Weighs approximately 3 pounds 1 ounce.

Frequently Asked Questions

What gas system length does this barrel use? A rifle-length gas system with a .750-inch gas journal diameter.

Is the muzzle threaded? Yes, 5/8-24 for standard AR-10 muzzle devices.

What twist rate does it use? A 1-in-10 twist, suited to common .308 Winchester bullet weights.

Buy the Proof Research AR-10 Barrel

Add match-grade stainless steel accuracy to your AR-10 build. Order this Proof Research barrel from our AR-10 barrel selection, and our Lubbock, Texas team will get it shipped fast.