The Rosco Manufacturing Bloodline Barrel (brand part no. BL-16-HB-300BLK-8-P) is a 16-inch, 300 Blackout barrel machined from 4150 chrome moly vanadium steel and finished with a nitride treatment. Rosco built its 300 Blackout barrel line with direct input from SOCOM end users and some of the original developers of the 300 Blackout cartridge, designing every barrel around the round’s original purpose: suppressor-friendly performance without sacrificing accuracy. Twist rate, gas port diameter, and barrel length were all engineered together rather than adapted from an existing 5.56 barrel, giving 300 Blackout shooters a barrel purpose-built for the cartridge instead of a generic reamed-out substitute.

Key Specifications

• Chambered in 300 AAC Blackout.
• Machined from 4150 chrome moly vanadium (CMV) steel.
• Finished with a nitride treatment for corrosion resistance.
• Rate of twist is 1:8 inch.
• Designed with input from SOCOM end users and 300 Blackout cartridge developers.
• Engineered to be suppressor-friendly without sacrificing accuracy.
• Gas port diameter is purpose-tuned for the 300 Blackout cartridge, not adapted from a 5.56 barrel.
• Part of Rosco’s Bloodline barrel series.
• Measures 16 inches in barrel length.

Frequently Asked Questions

Is this barrel suppressor-friendly? Yes, Rosco engineered the twist rate, gas port, and length specifically around suppressed 300 Blackout performance.

Who helped design this barrel? Rosco developed its 300 Blackout barrel line with input from SOCOM end users and some of the cartridge’s original creators.

What’s the twist rate? 1:8 inch.

Buy the Rosco Manufacturing Bloodline Barrel

A barrel engineered around the 300 Blackout cartridge from the ground up beats a generic reamed-out substitute every time. Order it from Rosco Manufacturing through our Lubbock, Texas gun shop, and we’ll get it moving as soon as it’s available, and browse more AR barrels to plan your build.