Proof Research PR15 PXT Stainless 6mm ARC Barrel, 14.5 in.

The Proof Research PR15 PXT 6mm ARC barrel (brand part no. 152232) is a 14.5-inch stainless steel AR-15 platform barrel built for shooters chasing long-range accuracy out of a compact upper. It’s cut from double stress-relieved 416R stainless, then cut-rifled, lapped, and borescope-inspected as part of Proof’s PXT process, which the company positions as extending barrel life while holding tight accuracy standards. The 6mm ARC chambering pairs a mid-length gas system with a 1:7.5 twist to stabilize the heavier-for-caliber bullets that make 6mm ARC popular for precision and hunting builds alike. At 14.5 inches it’s a solid choice for a shorter-barreled upper that still keeps 6mm ARC’s ballistics intact, whether the goal is a lightweight competition gun or a compact hunting rifle.

Key Specifications

• Chambered in 6mm ARC, a cartridge built around efficient long-range ballistics from an AR-15 magazine.
• Cut to a 14.5-inch length for a compact, well-balanced upper build.
• Rifled with a 1:7.5 twist rate to stabilize heavier 6mm ARC bullets.
• Machined from 416R stainless steel that’s double stress-relieved for straightness and accuracy.
• Threaded 5/8×24 at the muzzle for standard 6mm-caliber muzzle devices.
• Weighs approximately 3.1 pounds, keeping the finished upper reasonably light.

Frequently Asked Questions

What does PXT mean on a Proof Research barrel? It refers to Proof’s process for extending barrel life on steel barrels while holding to the same accuracy standards as their standard stainless barrels.

What gas system length does this barrel use? At 14.5 inches, it’s built around a mid-length gas system, which is the standard configuration for this length in 6mm ARC.

Buy the Proof Research PR15 PXT Stainless 6mm ARC Barrel

Build a precision 6mm ARC upper around a barrel engineered for accuracy and longevity. Shop more from Proof Research in our AR15 barrels category, ready to ship fast from our Lubbock, Texas gun shop.