Proof Research | PR15 Carbon Fiber AR Barrel | 6mm ARC | Stainless

Proof Research starts every barrel from a full‑profile, match‑grade 416R stainless steel blank, turns it down to a reduced contour, then wraps it in seven layers of differently‑angled, aerospace‑grade carbon fiber impregnated with the company's own proprietary resin. That carbon fiber has up to 30 times the specific strength and 7 times the specific stiffness of steel, which is how Proof gets a genuine 64% weight reduction over a comparable all‑steel barrel without giving up rigidity. Every barrel is still single‑point cut rifled and lead‑lapped -⁠- the same precision process used on Proof's steel barrels -⁠- and the helical wrap pattern actually improves longitudinal heat diffusion, so these barrels cool faster and hold accuracy longer through a real string of fire than the weight savings alone would suggest. The PR15 is built specifically for the AR‑15 platform in .223 Wylde and other common ARlengths, giving a semi‑auto rifle the same genuine weight reduction and heat‑dissipation advantage Proof's bolt‑action barrels are known for -⁠- a real difference when you're actually running strings of fire, not just single precision shots.