The Proof Research PXT 6mm ARC 16-Inch Steel AR Barrel (Proof Research part no. 152249) is a 16-inch steel AR-15 barrel that arrives fully chambered and ready to install. PXT stands for PROOF Exponential Twist, a rifling design that PROOF Research says reduces engraving force and throat erosion. It has a rifle-length gas system with a .750 gas journal and a .096 port, a 5/8-24 muzzle thread and a weight of 2 pounds 12 ounces. It is a solid base for a 6mm ARC AR-15 build.

Key Specifications

• The chambering is 6mm ARC, and the barrel arrives fully chambered.
• Barrel length is 16 inches, a standard rifle length.
• The twist is 7.5 PXT, PROOF Research’s exponential twist rifling meant to cut engraving force.
• Gas length is rifle, with a .096 port, which sets the dwell time of the gas system.
• The gas journal is .750, the diameter your gas block must match.
• The muzzle is threaded 5/8-24, the common pitch for brakes and suppressors.
• The barrel is made from traditional steel, which PROOF Research describes as long-lasting with strong erosion and corrosion resistance.

Frequently Asked Questions

What does PXT mean on this barrel? PXT stands for PROOF Exponential Twist. PROOF Research says the rifling reduces engraving force, minimizes throat erosion and smooths the bullet’s transition into the rifling, which also reduces felt torque.

Does it come chambered? Yes. PROOF Research says its PXT AR barrels arrive fully chambered and ready for installation.

Buy the Proof Research PXT 6mm ARC AR Barrel, 16-Inch Steel, Rifle Gas

This barrel gives a 6mm ARC build a chambered steel barrel with PROOF’s PXT rifling and a rifle-length gas system. See more AR-15 barrels and order from our Lubbock, Texas gun shop for fast, direct shipping.