The Rosco Manufacturing PB-16-SPR-6MM-7.5-R Purebred 6mm Arc 16" Nickel Boron Stainless Steel Barrel is purpose-built to get the most out of the 6mm Arc cartridge. Featuring a 16" stainless steel barrel with a precision SPR contour and threaded muzzle, it is designed to balance accuracy, durability, and manageable weight for modern AR builds.

This barrel uses a rifle-length gas system and a 1:7.5" twist rate optimized for popular precision bullet weights, including suppressed use. The nickel boron treatment and 416R stainless construction support consistent performance and corrosion resistance, making it well suited for range work, training, and hunting applications where reliable cold-bore accuracy matters. Rosco Manufacturing’s attention to detail and proven barrel craftsmanship are evident in the clean machining and thoughtful gas port sizing.

Key Features:

• Manufacturer: Rosco Manufacturing
• Model: Purebred PB-16-SPR-6MM-7.5-R
• Caliber: 6mm Arc
• Barrel Length: 16"
• Twist Rate: 1:7.5"
• Gas System: Rifle Length
• Barrel Material: 416R Stainless Steel
• Surface Treatment: Nickel Boron
• Product Type: Barrel