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This 8.2" Bloodline barrel pushes the limits of compact .300 Blackout design without cutting corners on reliability or accuracy. Built from proven 4150 Chrome Moly Vanadium steel and finished with a corrosion-resistant nitride treatment, it's engineered to handle the demands of real-world shooting whether you're running subs suppressed or pushing supersonic loads. Rosco developed this barrel working directly with SOCOM end users and the original creators of the .300 Blackout cartridge, which shows in every detail.
The gas port and system length have been carefully sized for this specific barrel length and cartridge combination. That means it cycles reliably with subsonic ammunition through a suppressor and still handles full-power supersonic loads without excessive gas noise. Users report excellent results running both ammo types with standard and adjustable gas blocks, and the barrel pairs well with H1 and H2 buffer setups. The heavy profile profile keeps things stable through rapid strings and thermal shifts without adding unnecessary weight.
The 1:7 twist rate excels at stabilizing heavy subsonic projectiles while remaining fully capable with lighter supersonic rounds. At 8.2", this is Rosco's shortest offering for pistol and SBR builds where every inch of compactness matters. The 5/8×24 threads fit standard suppressors, and the barrel includes a dimple for set-screw gas blocks. Fit and finish consistently impress buyers, with well-machined feed ramps and clean machining throughout. Pre-lapped by the manufacturer, it's ready to shoot accurately from round one.
Yes. The gas port is optimized for reliable cycling with subsonic loads through a suppressor and still handles full-power supersonic ammunition without issues. Most users run it with standard gas blocks, though adjustable blocks allow fine-tuning. The 1:7 twist stabilizes heavy subsonic bullets while remaining fully functional with lighter supersonic rounds.
The 8.2" is the shortest offering, designed for extreme compactness in pistol and SBR builds. The 10.5" gives you more velocity and dwell time while staying very suppressor-friendly. The 16" moves into traditional rifle territory for those who need a non-NFA configuration. All three are suppressor-optimized, but barrel length impacts velocity and how different ammo types perform.
Yes. Rosco pre-laps every Bloodline barrel, which means it's ready for consistent accuracy from the first shot without any break-in period needed. The feed ramps are cleanly machined and the bore is finished to exacting standards, so you get quality right out of the package.
This barrel only includes the barrel itself. You'll need to source the gas tube, bolt carrier group, and gas block separately. Rosco does offer "Sauce Pack" bundles that combine the barrel with these components if you prefer an all-in-one solution.
| UPC | 181969500111 |
|---|---|
| Manufacturer | |
| Manufacturer Part Number | BL-82-HB-300BLK-7-P |
| Length | 8.20" |
| Model | |
| Product Type | Barrel |
| Color | Black |
| Caliber/Gauge | .300 AAC Blackout |
| Barrel Length | 8.2" |
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