The Rosco Manufacturing Bloodline Barrel (brand part no. BL-16-M4-556-7-C) is a 16-inch, 5.56 NATO barrel machined from 4150 chrome-moly-vanadium steel and finished in nitride for a durable, corrosion-resistant M4 carbine build. Rosco Manufacturing cuts an M4 barrel contour with properly sized gas ports that optimize cycling performance, reducing the premature wear and carbon buildup common on over-gassed barrels. Balanced for handling, it is a strong next build option for a duty or range-ready carbine.

Key Specifications

• Chambered in .223 Rem/5.56 NATO.
• Measures 16 inches in length.
• 1:7 twist rate.
• Machined from 4150 chrome-moly-vanadium (CMV) steel.
• Finished in nitride for corrosion and wear resistance.
• Cut with an M4 barrel contour.
• Properly sized gas ports optimize cycling performance.
• Reduces premature wear from over-gassing.
• Balanced profile for handling.

Frequently Asked Questions

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

What is the twist rate? 1:7.

What barrel contour is this? An M4 profile.

Buy the Rosco Manufacturing Bloodline Barrel

Build or upgrade your M4 carbine with a nitride-finished 16-inch barrel. Order it from our AR15 barrels selection at our Lubbock, Texas gun shop for fast, direct shipping.