Rosco Bloodline 12.5 in M4 5.56 NATO Nitride Barrel

The Rosco Manufacturing Bloodline 12.5 inch M4 barrel is a compact AR-15 barrel chambered for .223 Rem/5.56 NATO and built for short carbine, SBR, and pistol-style builds. It features a Nitride finish and 4150 CMV steel construction as indicated in the product listing. Engineered with a 1:7 rate of twist and a carbine gas system, this barrel is intended for modern carbine applications that require a compact, durable component.

Key Specifications

• Manufacturer: Rosco Manufacturing.
• Model: Bloodline.
• Chambering: .223 Rem/5.56 NATO.
• Barrel length: 12.5 inches.
• Finish: Nitride.
• Material: 4150 CMV steel.
• Rate of twist: 1:7.
• Gas system length: Carbine.
• Muzzle threads: 1/2-28.
• Contour: Government.

Compact, reliably finished, and built with specifications aimed at modern carbine users, the Bloodline 12.5 in barrel gives builders a durable, short-profile option for compact AR-15 projects. Its combination of Nitride treatment, established twist rate, and carbine gas system make it a practical choice for suppressed setups, SBR builds, or any application where a shortened barrel is required without sacrificing material quality.