Rosco Bloodline 10.5″ 300 Blackout Barrel
Not Yet Rated | Write the First Review SKU: 222-ROS-BL-105-HB-300BLK-7-P
UPC: 182000000000
MFG#: BL-105-HB-300BLK-7-P

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:

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.