The Proof Research PR15 Barrel is a carbon fiber-wrapped AR-15-pattern barrel chambered in .338 ARC, built in a pistol-length gas system for AR-pistol builds (Proof Research part no. 144794).

Key Specifications

• Chambered in .338 ARC
• 12-inch barrel length
• 1-in-8 rate of twist
• Pistol-length gas system
• .750-inch gas journal diameter
• 5/8-24 muzzle thread
• Carbon fiber-wrapped construction

Frequently Asked Questions

Is this a complete rifle or just the barrel? This listing is the bare barrel only, with no upper, lower, or gas system parts included.

Does a 12-inch barrel make this an NFA short-barreled rifle? Not by itself — this is a bare barrel with a pistol-length gas system and no lower included; a 12-inch barrel is legal without NFA registration when built into a pistol-configured (no shoulder stock) firearm. Assembling it onto a rifle-configured lower with a stock would require NFA compliance. Confirm your complete build’s configuration before assembly.

What gas system length does this barrel use? It’s built with a pistol-length gas system and a .750-inch gas journal.

Buy the Proof Research AR-15 Pistol Barrel, .338 ARC, 12-Inch, .750 Gas Journal

Order the Proof Research AR-15 Pistol Barrel, .338 ARC, 12-Inch, .750 Gas Journal from a Lubbock, TX gun shop. Shop more Proof Research parts or browse the AR15 Barrels category at Schaefer Defense.