Rosco Bloodline 16″ 5.56 NATO Nitride M4 Mid-Length Barrel

Description

The Rosco Manufacturing Bloodline 16″ M4 mid-length barrel is a purpose-built AR-15 barrel finished in nitride and specified as a 4150 CMV component. Designed around USASOC Improved Upper Receiver Group criteria, its longer gas system provides a smoother gas curve and more controlled dwell times. The M4 contour and mid-length gas system aim to balance handling and reliable cycling for a variety of shooting roles. This barrel is suited to general-purpose shooting, competition, and range applications where consistent performance is required.

Key Specifications

• The barrel length is 16 inches for a classic carbine profile.
• Chambered for .223 Rem / 5.56 NATO cartridges.
• Finished with a Nitride surface treatment for corrosion resistance and durability.
• Constructed as a 4150 CMV barrel as indicated in product naming.
• The rate of twist is 1:7 to stabilize a wide range of projectile weights.
• Equipped with a Mid-Length gas system for a smoother gas curve.
• Features an M4 contour for familiar handling and fitment.
• The muzzle is threaded 1/2-28 for compatible muzzle devices.
• Designed to fit AR-15 platforms and standard upper assemblies.
• The barrel weight is approximately 2 lbs.

Whether building a service-style carbine or upgrading a range rifle, the Bloodline 16″ barrel delivers a balanced blend of durability, tuned gas performance, and familiar M4 handling. Its nitride finish and 4150 CMV construction make it a practical choice for shooters seeking consistent function and a reliable foundation for a versatile AR-15 build.