Proof Research PR15 AR-Style Barrel 6mm ARC 20″ Stainless

The Proof Research PR15 AR-style barrel is a stainless steel, medium-contour rifle barrel chambered for 6mm ARC. Built for shooters who value consistent barrel metallurgy and precision rifling, this 20-inch barrel features a 1:7.5 twist rate and standard 5/8-24 muzzle threading for common muzzle devices. The rifled bore and stainless finish offer good erosion resistance and corrosion protection for extended use.

Key Specifications

• The brand is Proof Research.
• The model is an AR-Style Barrel (PR15).
• The caliber is 6mm ARC.
• The barrel length measures 20 inches.
• The twist rate is 1:7.5.
• The barrel type/length specification is Rifle +1 Length.
• The finish/material is Stainless Steel.
• The muzzle thread pattern is 5/8-24.
• The bore is Rifled.
• The contour is Medium.

This PR15 barrel pairs durable stainless construction with a twist rate suited to a wide range of 6mm ARC projectiles, making it a practical choice for precision-oriented AR builds. Its 5/8-24 threading and medium contour balance compatibility and handling while the rifled bore and stainless finish support longevity and reliable performance in the field.