The Proof Research PR15 6mm ARC 14.5in PXT AR Barrel (brand part no. 152164) is a AR-platform barrel chambered in 6mm ARC and cut to 14.5 inches, rifled with Proof’s PXT geometry to reduce engraving force and throat erosion for longer barrel life.

Key Specifications

• Chambered in 6mm ARC
• Barrel length of 14.5 inches
• Rifling twist rate of 1-in-7.5
• Rifled with Proof’s PXT rifling geometry, reducing engraving force and throat erosion

Frequently Asked Questions

What does PXT rifling do? Proof’s PXT 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.

Is this barrel itself an NFA item? No. This is a bare barrel under the 16-inch federal rifle minimum with no receiver included, so it is not itself a regulated Short-Barreled Rifle. Putting it on a shouldered rifle lower makes a short-barreled rifle; since October 9, 2026, ATF no longer requires Form 1 approval or registration for that, but state law still applies, and taking an SBR across state lines needs an approved ATF Form 5320.20.

Buy the Proof Research PR15 6mm ARC 14.5in PXT AR Barrel

Order the Proof Research PR15 6mm ARC 14.5in PXT AR Barrel from our catalog, or browse more AR15 barrels at Schaefer Defense. Ships fast from our Lubbock, Texas gun shop.