The Proof Research PR15 6mm ARC 18in Carbon Fiber AR Barrel (brand part no. 152188) is a PR15-series AR-platform barrel chambered in 6mm ARC and built from carbon fiber, rifled with Proof’s PXT geometry to reduce engraving force and throat erosion for longer barrel life. It ships fully chambered and ready to install onto a rifle +1-length AR-15 gas system.

Key Specifications

• Chambered in 6mm ARC
• Barrel length of 18 inches
• Rifling twist rate of 1-in-7.5
• Built for a Rifle +1-length AR-15 gas system
• Gas block journal diameter of .750-inch
• Gas port diameter of .096-inch
• Muzzle threaded 5/8-24
• Finished weight of approximately 1 lb 14 oz
• Constructed from carbon fiber, with Proof’s PXT rifling geometry

Frequently Asked Questions

What does PXT rifling do? Proof’s PXT (Proof Exponential Twist) geometry reduces rifling lead angle and smooths bullet engagement, cutting engraving force and throat erosion for longer barrel life.

Is this barrel ready to install? Yes, it arrives fully chambered and ready to install onto a compatible AR-15 upper.

Buy the Proof Research PR15 6mm ARC 18in Carbon Fiber AR Barrel

Order the Proof Research PR15 6mm ARC 18in Carbon Fiber AR Barrel from our catalog, or browse more AR15 barrels at Schaefer Defense. Ships fast from our Lubbock, Texas gun shop.