Rosco Bloodline 8.2″ 300 Blackout Barrel

Rosco Bloodline 8.2″ 300 Blackout Barrel


Availability: In stock SKU: BL-82-HB-300BLK-7-P

Gas Tubes

Gas tubes include a roll pin.

Gas Blocks

Low profile gas blocks.

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  • All NFA/ATF Rules Apply
  • Questions & Answers


Rosco Bloodline 8.2″ 300 Blackout Barrel

All ATF/NFA Rules Apply – See NFA tab for details

The Rosco Bloodline 8.2″ 300 Blackout barrel was created with input from SOCOM end users and the Advanced Armament Corporation.  The Rosco Bloodline 8.2″ 300 Blackout barrel is designed to extract the full potential of the 300 Blackout caliber in a SBR platform in conjunction with a suppressor.  Rosco took into account the twist-rate, gas port diameter, and barrel length to bring you a high performance, optimally balanced barrel for your next custom AR build.

Bloodline series barrels are Rosco’s hardest working barrel. No matter if you’re a hobbyist, tactical shooter, or Law Enforcement Officer, Rosco has a barrel that will fit your needs. All of the Bloodline barrels are made from scratch in their Rhode Island facility from a blank piece of steel. The Rosco Manufacturing Bloodline 8.2″ 300 Blackout barrel is machined from 4150 CMV steel, a 1:7 twist, featuring an 11 degree crown, .750 gas block diameter, pistol length gas, and finished in Black Nitride.

Arm or Ally is proud to add Rosco Manufacturing to our wide selection of AR Barrels from Ballistic Advantage and Faxon. If you just starting to build your own custom rifle, see our our growing selection of AR parts, to include receivers, bolt carrier groups, muzzle devices, and more in our AR parts department. Are you a reloader, or considering becoming one? We offer a large selection of bullets and brass to choose from.

Product Information

Manufacturer: Rosco Manufacturing
Series: Bloodline
Profile: Heavy
Part #: BL-82-HB-300BLK-7-P
Caliber: 300 Blackout
Length: 8.2″
Material: 4150 CMV
Finish: Black Nitride
Gas System Length: Pistol Length
Gas Block Diameter: .750″
Twist Rate: 1:7 inches
Muzzle: 5/8 x 24 threaded
Weight: 17.73 oz
MSRP: $145.00

Additional information

Weight 29 oz
Dimensions 16 × 2 × 2 in

QPQ Nitride




300 Blackout


Rosco Manufacturing


4150 Chrome Moly Vanadium


Barrel, Upper Receiver Parts








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You may use this barrel with a lower receiver that is a Registered SBR, Machine Gun, or Pistol. Possession of this barrel along with a Non-NFA lower receiver is Prohibited, except when installed on a Pistol configuration firearm.