The Proof Research PR15 Stainless Steel Barrel, 6mm ARC, 16" Rifle Length, 5/8x24 Thread, 1-7.5 Twist is engineered for shooters who demand consistent precision from their AR-15 platform. Built from premium stainless steel with a carefully tuned rifle-length gas system, this drop-in barrel is optimized around the 6mm ARC cartridge to deliver smooth cycling, reduced fouling, and reliable extraction shot after shot.

This 16" threaded barrel is ideal for building or upgrading an AR-15 for range work, practical competition, or hunting where accuracy and repeatable performance matter. The 1-7.5 twist rate stabilizes modern high-BC 6mm projectiles, while the 5/8x24 muzzle threads accept a wide variety of brakes and suppressor mounts. Backed by Proof Research’s reputation for rigorous engineering and attention to detail, it offers a refined balance of durability, accuracy, and reliability in a purpose-built AR barrel.

Key Features:

• Manufacturer: Proof Research
• Model: PR15 Stainless Steel Barrel, 6mm ARC, 16" Rifle Length
• Caliber: 6mm ARC
• Barrel Length: 16"
• Twist Rate: 1-7.5
• Threaded Barrel: 5/8x24