The Proof Research PR15 PXT is a carbon fiber barrel for AR-15 builds, chambered in .300 Blackout with a 16.00" length. Proof's carbon fiber construction gives a high stiffness-to-weight ratio, taking weight off the front of the rifle so it balances better and stays easier to carry and hold steady.

PXT is Proof's Exponential Twist rifling, a rework of conventional rifling geometry and twist progression that lowers engraving force, reduces throat erosion and eases the bullet's entry into the rifling. At 16.00" with a carbine-length gas system, this barrel meets the 16.00" minimum for a standard .300 Blackout AR-15 rifle that runs supersonic loads for range work and subsonic loads for quiet shooting.

• Brand: Proof Research
• Model: PR15 PXT
• Platform: AR-15
• Caliber: .300 Blackout
• Barrel Length: 16.00"
• Gas System: Carbine Length
• Construction: Carbon Fiber, PXT Rifling