Rosco Bloodline 16-inch M4 Barrel 5.56 NATO 1:7

Description

The Rosco Manufacturing Bloodline 16-inch M4 Carbine barrel is a purpose-built AR-15 barrel chambered for .223 REM/5.56 NATO. It features a carbine gas system and M4 contour intended for carbine-style builds and duty-pattern configurations. The barrel includes a Nitride finish and 1/2-28 muzzle threads, with a 1:7 twist rate chosen for compatibility with a range of 5.56 profiles. Rosco’s Bloodline design emphasizes balanced gas sizing and component selection to address common carbine gas and wear considerations.

Key Specifications

• The barrel length is 16 inches.
• Chamber/cartridge is .223 REM/5.56 NATO.
• The finish is Nitride.
• The rate of twist is 1:7.
• The muzzle threads are 1/2-28.
• The gas system length is Carbine.
• The contour is M4.
• The material designation from manufacturer listing is 4150 CMV.
• The listed barrel weight is 2 lbs.

Designed for builders and operators who prioritize a balanced carbine platform, the Bloodline 16-inch barrel pairs a Nitride finish and an M4 contour with a carbine gas system to provide a durable, service-oriented option for AR-15 builds. Its specification set makes it appropriate for range use, duty-style carbine configurations, and builds where consistent gas management is desired.