The Rosco Manufacturing Bloodline 16-Inch 5.56 NATO Heavy Barrel (brand part no. BL-16-HB-556-7-C) is a heavy-contour AR-15 barrel built for shooters who run their rifles hard without babying them. Rosco machines it from 4150 Chrome-Moly Vanadium steel and finishes the bore and exterior in a nitride coating for wear and corrosion resistance, then cuts a 1:7-inch rifling twist that stabilizes the full range of common 5.56 NATO and .223 Remington bullet weights, including heavier match loads. At 16 inches, it keeps the rifle in rifle-length configuration, and the heavy contour adds the mass Rosco designed this barrel around for sustained, hard-use shooting rather than lightweight carry.

Key Specifications

• Chambered in .223 Remington/5.56 NATO.
• Barrel measures 16 inches.
• Rifled with a 1:7-inch twist for stabilizing heavier bullet weights.
• Machined from 4150 Chrome-Moly Vanadium (CMV) steel.
• Finished with a nitride coating for wear and corrosion resistance.
• Cut to a heavy contour profile for sustained, hard-use shooting.
• Part of Rosco’s Bloodline barrel series.

Frequently Asked Questions

What caliber is this barrel chambered in? .223 Remington/5.56 NATO.

What rifling twist rate does it use? A 1:7-inch twist, which stabilizes heavier common 5.56/.223 bullet weights.

What is this barrel made from? 4150 Chrome-Moly Vanadium steel with a nitride finish.

Buy the Rosco Manufacturing Bloodline 16-Inch 5.56 NATO Heavy Barrel

Build a rifle-length AR-15 upper that can take sustained hard use without complaint. Order it from our Rosco Manufacturing lineup, part of our AR15 barrels selection, at our Lubbock, Texas gun shop for fast, direct shipping.