Rosco Bloodline 10.5" 300 Blackout Barrel

Rosco Bloodline 300 Blackout Barrel

The Rosco Bloodline 10.5" barrel represents a purpose-built solution for shooters who demand subsonic performance in compact platforms. Engineered specifically for suppressed fire, this barrel excels in short-barreled rifle and pistol configurations where space and sound signature matter.

Design and Application

This barrel serves as a direct replacement for MK 18 platforms originally chambered in 5.56 NATO, allowing you to convert existing systems to 300 Blackout without major modifications. The 10.5" length provides the ideal balance between velocity and maneuverability—long enough to stabilize subsonic ammunition reliably, yet short enough for true tactical handling.

Construction

Nitride 4150 CMV Steel: The barrel is manufactured from 4150 Chrome Moly Vanadium steel with a durable nitride finish. This combination provides excellent corrosion resistance and extends barrel life, even when running suppressed and shooting corrosive ammunition.

Practical Advantages

• Suppressor Optimized: Designed to work seamlessly with sound suppressors for subsonic 300 Blackout loads
• Accessory Compatible: The 10.5" length accommodates longer rail systems, allowing comfortable mounting of PEQ-15 infrared aiming devices, D-BAL laser systems, and other tactical optics
• Proven Platform: Direct compatibility with established MK 18 configurations reduces installation complexity

Whether you're building a dedicated subsonic platform or converting an existing rifle, the Rosco Bloodline barrel delivers the precision and reliability serious shooters expect.