The Rosco Manufacturing Bloodline Barrel (brand part number BL-105-M4-556-7-C) is a 10.5-inch M4-profile barrel chambered in 5.56 NATO, machined from 4150 Chrome-Moly-Vanadium (CMV) steel and built as the perfect addition to any SBR or AR-15 pistol build. Rosco finishes the barrel with a durable nitride coating for corrosion resistance and cuts a fast 1:7-inch twist rate that stabilizes the full range of 5.56/.223 bullet weights, including heavier match and tracer loads. It’s a straightforward drop-in upgrade for shooters building a short-barreled platform who want a durable, mil-spec-pattern barrel without compromising reliability.

Key Specifications

• Chambered in .223 Remington/5.56 NATO.
• Measures 10.5 inches in barrel length.
• Machined in an M4 profile/contour.
• Built from 4150 Chrome-Moly-Vanadium (CMV) steel.
• Finished with a durable nitride coating.
• Rifled with a fast 1:7-inch twist rate.
• Purpose-built for SBR or AR-15 pistol builds.

Frequently Asked Questions

What builds is this barrel meant for? It’s designed as the perfect addition to any SBR or AR-15 pistol build.

What twist rate does it use? A fast 1:7-inch twist, which stabilizes the full range of 5.56/.223 bullet weights.

What is the barrel made from? 4150 Chrome-Moly-Vanadium (CMV) steel with a nitride finish.

Buy the Rosco Manufacturing Bloodline 10.5-Inch 5.56 NATO M4 Nitride Barrel

Build a reliable short-barreled AR platform on a mil-spec-pattern barrel. Order it from our Rosco Manufacturing lineup, part of our AR barrels selection, at our Lubbock, Texas gun shop for fast, direct shipping.