The Rosco Manufacturing Bloodline 5.5" 9mm 1:10 Barrel is a compact AR-15 barrel designed for builders who want a short, suppressed-ready 9mm setup without giving up consistency or reliability. Built from 4150 CMV steel with a black nitride treatment, this medium-profile barrel balances durability with smooth handling while its threaded muzzle is ready for your preferred muzzle device or suppressor.

This 5.5" 9mm barrel uses a 1:10 twist rate optimized for common 9mm Luger loads, supporting dependable accuracy across a wide range of ammunition. Its blowback-compatible design makes it a strong choice for pistol-caliber carbines, braced pistols, and compact range builds where overall length matters. The precise machining and clean crown reflect Rosco’s focus on practical performance and consistent craftsmanship.

• Manufacturer: Rosco Manufacturing
• Model: Bloodline
• Caliber: 9mm Luger (9x19)
• Barrel Length: 5.5"
• Twist Rate: 1:10
• Barrel Material: 4150 CMV
• Barrel Profile: Medium