The Rosco Manufacturing BL-82-HB-300BLK-7-P Bloodline 300 Blackout 8.20" Nitride 4150 CMV Barrel is a heavy-profile, threaded AR-15 barrel built specifically around the 300 BLK cartridge. Measuring 8.2 inches with a 5/8x24 muzzle thread and nitride-treated 4150 CMV steel, it is engineered to deliver reliable accuracy and durability in compact pistol and SBR builds, especially when paired with a suppressor.

This barrel uses a pistol-length gas system and a .750 gas block journal to optimize cycling with both subsonic and supersonic 300 BLK loads. The short 8.2" length makes it well suited for personal protection firearms, range use, and training-focused AR pistols where maneuverability matters. Rosco Manufacturing’s Bloodline series reflects careful attention to gas port sizing, twist rate, and overall construction, resulting in a barrel that balances performance, longevity, and consistent craftsmanship.

Key Features:

• Manufacturer: Rosco Manufacturing
• Model: Bloodline BL-82-HB-300BLK-7-P
• Caliber: 300 Blackout / 300 BLK
• Barrel Length: 8.2"
• Barrel Profile: Heavy
• Barrel Material: 4150 CMV Steel
• Barrel Finish: Nitride / Melonite
• Twist Rate: 1:7
• Gas System Length: Pistol
• Gas Block Size: 0.750"
• Muzzle Thread Pattern: 5/8x24
• UPC: 181969500111