PROOF Research PR15 6mm ARC 18″ Barrel | 7.5 Twist PXT Carbon Fiber

Elevate your AR-15 platform with the PROOF Research PR15 Barrel in 6mm ARC, a precision-engineered barrel designed for shooters who demand elite performance. Built with PROOF Research’s industry-leading carbon fiber wrapped steel technology, this 18-inch barrel delivers exceptional rigidity, heat dissipation, and weight savings over traditional steel barrels — without sacrificing accuracy or durability.

The 6mm ARC (Advanced Rifle Cartridge) chambering makes this barrel an outstanding choice for long-range hunters, competitive shooters, and tactical enthusiasts seeking superior ballistic performance from the AR-15 platform. Paired with a 7.5-inch twist rate (1:7.5), this barrel stabilizes a wide range of 6mm projectiles, from lighter varmint loads to heavy, high-BC bullets optimized for extended range shooting.

The PXT (Profiled eXternal Tenon) profile ensures compatibility with standard AR-15 components and barrelnut systems, making installation straightforward for gunsmiths and experienced builders alike.

Key Features:
– Caliber: 6mm ARC
– Barrel Length: 18 inches
– Twist Rate: 1:7.5
– Profile: PXT (Profiled eXternal Tenon)
– Platform: AR-15 / PR15
– Construction: PROOF Research carbon fiber wrapped steel
– Manufacturer: PROOF Research
– SKU: 152188

Whether you’re building a dedicated long-range hunting rifle or a precision competition setup, the PROOF Research PR15 6mm ARC barrel delivers the consistency and craftsmanship that serious shooters expect. At Deep Roots Rifle Co, we stock hard-to-find components like this so you don’t have to wait. Order online today or visit our gun store in Eustis, Florida, where our knowledgeable staff can help you complete your custom build.