Rosco Bloodline 5.56 NATO 14.5″ M4 Nitride Barrel

This Rosco Manufacturing Bloodline 14.5″ barrel is built for the M4 carbine platform and designed for duty and patrol-style carbine builds. It is chambered for .223 Rem / 5.56 NATO and finished with a durable Nitride treatment. The barrel uses a 1:7 rate of twist and a carbine-length gas system tailored for modern carbine configurations. All NFA rules apply when configuring short-barreled rifles or attaching regulated parts.

Key Specifications

• The barrel measures 14.5 inches for M4 carbine applications.
• Chambering is .223 Rem / 5.56 NATO to support common carbine cartridges.
• The finish is Nitride for corrosion resistance and surface hardness.
• Material is 4150 CMV, as specified in the product description.
• The rate of twist is 1:7 to stabilize a wide range of bullet weights.
• The muzzle is threaded 1/2-28 to accept standard muzzle devices.
• The gas system length is Carbine for reliable cycling in carbine builds.
• The contour is an M4 profile for compatibility with M4-pattern components.
• The barrel weight is approximately 2 lbs.
• Product type is Barrel intended for AR-15 / M4 platforms.

Engineered for shooters who prioritize durability and predictable performance, the Rosco Bloodline 14.5″ Nitride barrel combines proven materials and specification choices to suit patrol, duty, and precision-minded carbine builds. Its 1:7 twist and M4 contour provide a balanced foundation for modern carbine configurations while the Nitride finish increases service life. This barrel is a practical option when assembling a purpose-driven AR-15/M4 platform.