Proof Research PR15 PXT 6mm ARC Carbon Fiber AR Barrel, 20-inch

The Proof Research PR15 PXT 6mm ARC Carbon Fiber AR Barrel, 20 inches (brand part no. 152195), is a complete, chambered AR-15 platform barrel built with Proof Research’s PXT progressive-twist rifling. Proof Research builds this barrel from a match-grade 416R stainless steel core wrapped in proprietary aerospace-grade carbon fiber, cutting significant weight versus a comparable all-steel AR barrel without sacrificing rigidity or accuracy potential. This barrel is cut with Proof Research’s PXT, or PROOF Exponential Twist, rifling — a progressive twist rate that starts far more gradually than a traditional barrel before accelerating through the bore, engaging the bullet more gently to reduce engraving force, extend barrel life, and tighten group sizes. Chambered in 6mm ARC and threaded 5/8-24, this 20-inch barrel is built for shooters chasing long-range accuracy and extended barrel life from a modern, high-BC AR cartridge.

Key Specifications

• Chambered in 6mm ARC, a modern high-BC cartridge for long-range AR-15 shooting.
• Cut to a 20 inch length, maximizing velocity for long-range work.
• Threaded 5/8-24 at the muzzle, ready for a brake or suppressor.
• Rifled with PXT progressive-twist rifling for reduced bullet engraving force and longer barrel life.
• Built around a 416R stainless steel core wrapped in aerospace-grade carbon fiber.

Frequently Asked Questions

What is PXT rifling? PXT, or PROOF Exponential Twist, is a progressive twist rate that starts more gradually than a traditional barrel before accelerating through the bore, which Proof Research states can extend barrel life and tighten groups.

Is this barrel threaded? Yes, it’s threaded 5/8-24 and ready for a brake or suppressor.

Buy the Proof Research PR15 PXT 6mm ARC Carbon Fiber AR Barrel

Long-range AR-15 shooters running 6mm ARC will get real accuracy and barrel-life benefits from Proof’s newest PXT rifling paired with carbon fiber weight savings. Order it through our Lubbock, Texas gun shop and browse more rifle barrels from Proof Research and other trusted brands.