Proof Research 6mm ARC 20″ Carbon Fiber AR Barrel 1:7.5

Description

The Proof Research 6mm ARC 20″ carbon-fiber-wrapped AR-style barrel is built for shooters assembling precision-minded AR-platform rifles. It is chambered for 6mm ARC and features a 1:7.5 twist rate intended to stabilize a wide range of bullets. The barrel comes threaded at the muzzle for 5/8-24 accessories and carries a carbon fiber wrapped exterior for reduced weight compared with traditional all-steel profiles. This configuration suits accurate, lightweight rifle builds focused on consistent barrel harmonics.

Key Specifications

• The cartridge is 6mm ARC.
• The barrel measures 20 inches.
• The twist rate is 1:7.5.
• The muzzle threads are 5/8-24.
• The barrel is carbon fiber wrapped for a lighter profile.
• The barrel is an AR-style model intended for AR-platform rifles.
• The bore is rifled.
• The model/type designation is PR15 (as listed in manufacturer data).

Engineered to balance weight savings and consistent performance, this Proof Research barrel is a practical choice for informed shooters building precision-capable AR-platform rifles in 6mm ARC. Its carbon fiber wrap and threaded muzzle provide flexibility for a variety of build goals while keeping focus on accuracy and handling.