Bloodline 10.5″ 300 Blackout Barrel – Rosco Manufacturing
Built for Suppression. Ready for Mission-Critical Performance.
The Rosco Bloodline 10.5″ 300 Blackout Barrel was purpose-built for SBRs, AR pistols, and suppressed platforms, blending real-world feedback from SOCOM end users and .300 BLK experts into a battle-ready barrel optimized for both subsonic and supersonic performance.
This 10.5″ barrel is a direct drop-in for any MK18-style upper, offering improved performance over 5.56 NATO in close-quarters, suppressed shooting environments. Featuring a .750 gas block journal, pistol-length gas system, and precision-cut 11° target crown, this barrel provides exceptional reliability and accuracy—whether you’re running suppressed subs or full-power supers.
? Key Features:
✅ Optimized for Suppressors – Designed to deliver reliable cycling with subsonic or supersonic ammo.
⚙️ Drop-In for MK18 Platforms – Upgrade your 5.56 SBR with a 300 BLK barrel engineered for short-barrel reliability.
? SOCOM-Inspired Design – Developed with input from military end users and .300 BLK creators.
? Twist Rate: 1:7 – Stabilizes a wide range of bullet weights, ideal for subsonic heavy grain projectiles.
? Durable Construction – Made from 4150 CMV steel with a nitride finish for corrosion resistance and barrel longevity.
Technical Specifications:
| Feature | Specification |
|---|---|
| Length | 10.5″ |
| Caliber | 300 AAC Blackout (300 BLK) |
| Material | 4150 CMV Steel |
| Twist Rate | 1:07 |
| Gas System | Pistol-Length |
| Gas Block Size | .750″ |
| Thread Pitch | 5/8 x 24 |
| Profile | Heavy |
| Crown | 11° Target Crown |
| Finish | Nitride (Barrel & Extension) |
| Weight | 21.4 oz |
| Platform Fit | AR-15 / MK18 SBR / AR Pistol |
Why Choose the Rosco Bloodline 10.5″ 300 BLK Barrel?
The 10.5” length offers ideal harmonics for suppressed fire, while the heavy profile and nitride finish ensure consistent accuracy and long-term durability. Perfect for CQB setups, night vision platforms using PEQ-15 or D-BAL series lasers, or any shooter who demands military-grade performance from their .300 Blackout rifle.
WARNING: This product can expose you to Lead, which is known to the State of California to cause cancer and birth defects or other reproductive harm. For more information go to – www.P65Warnings.ca.gov.
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