Proof Research AR-Style Barrel 6mm ARC 18" 1:7.5 Twist Stainless Steel Rifle Length - Threaded

The Proof Research AR-Style 6mm ARC 18" Stainless Steel Barrel is a precision drop-in replacement barrel built for AR-platform rifles chambered in the versatile 6mm ARC cartridge. Part of Proof Research's Traditional Steel series, this barrel is engineered for long service life and is designed to handle the extreme pressures the 6mm ARC is capable of producing, making it a strong foundation for a custom AR-15 build.

At 18" in length, this barrel pairs a 1:7.5" twist rate with a rifle-length gas system and a .750" gas journal diameter for reliable cycling with a wide range of 6mm ARC bullet weights. The muzzle is threaded for a muzzle device or suppressor, and the barrel is finished in Proof Research's corrosion-resistant stainless steel finish. It is supplied as a bare barrel with no sights installed, ready to be headspaced and installed on a compatible AR-platform upper receiver.

Whether you are building a precision 6mm ARC AR-15 for hunting, competition, or defensive use, this Proof Research Traditional Steel barrel delivers the accuracy and durability that the brand is known for.