The Rosco Bloodline 8.2in .300 Blackout Barrel (brand part no. BL-82-HB-300BLK-7-P) is the shortest option in Rosco’s 300 Blackout lineup, built for SBR and pistol use with suppressors and offering the flexibility of a shorter Personal Defense Weapon build without sacrificing performance or ballistics. Rosco developed its 300 Blackout barrels with input from SOCOM end users and some of the caliber’s original creators, tuning twist rate, gas port diameter, and length specifically to optimize the cartridge’s suppressor-friendly, accurate design. This 1:7-twist heavy barrel is built to run reliably with both subsonic and supersonic 300 Blackout ammunition depending on barrel length. This is a bare barrel only, sold without an upper or lower receiver, and it does not by itself make a complete regulated firearm.

Key Specifications

• Chambered in .300 AAC Blackout.
• 8.2-inch barrel length, Rosco’s shortest 300 Blackout option.
• 1:7 twist rate.
• Heavy barrel (HB) contour.
• Designed for SBR and suppressed pistol builds.
• Tuned for both subsonic and supersonic 300 Blackout loads.

Frequently Asked Questions

Is this barrel a complete firearm? No, it’s sold as a bare barrel only, without an upper or lower receiver, so it is not by itself a regulated firearm.

Do NFA rules apply to this barrel? Federal short-barreled rifle rules apply once an 8.2-inch barrel like this is installed on a complete, shouldered rifle without a prior approved ATF Form 1. Building it into a pistol configuration with an arm brace, or installing it on a lower that already has SBR approval, avoids that issue. All applicable NFA rules must be followed based on how the final firearm is configured.

What ammunition is this barrel tuned for? Both subsonic and supersonic .300 Blackout loads, with twist rate and gas port sized specifically for the cartridge.

Buy the Rosco Bloodline 8.2in .300 Blackout Barrel

Build a compact 300 Blackout PDW without giving up performance. Order the Rosco Manufacturing barrel from our AR barrels selection at our Lubbock, Texas gun shop for fast, direct shipping.