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Description
Rosco Manufacturing Bloodline 11.5" M4 Profile 5.56 NATO AR-15 Barrel
Build a compact, capable AR-15 with the Rosco Manufacturing Bloodline 11.5-inch M4 Profile 5.56 NATO Barrel. Engineered for modern carbine applications, this nitrided 4150 CMV barrel combines a carbine-length gas system, 1:7 twist rate, and practical M4 profile for dependable performance in short-barreled rifle and pistol configurations. All applicable NFA rules apply.
Built for Modern Compact AR-15 Configurations
The Bloodline 11.5-inch barrel is designed around the operating demands of compact 5.56 NATO platforms. Its carbine-length gas system supports balanced function in SBR and AR pistol builds, including setups configured for suppressed use.
Durable 4150 CMV Construction
Made from 4150 CMV steel and finished inside and out with nitride treatment, this barrel is built to provide corrosion resistance and long-term durability. The nitrided barrel extension complements the barrel finish for a cohesive, hard-wearing assembly.
Key Features
- 11.5-inch 5.56 NATO AR-15 barrel
- Rosco Manufacturing Bloodline series
- 4150 CMV steel construction
- M4 barrel profile
- 1:7 twist rate for common 5.56 NATO projectile weights
- Carbine-length gas system
- .750-inch gas block journal
- 1/2x28 threaded muzzle
- 11-degree target crown
- Nitride barrel and barrel extension finish
- Compatible with standard AR-15 upper receivers
Specifications
- Manufacturer: Rosco Manufacturing
- Model: Bloodline
- Manufacturer Part Number: BL-115-M4-556-7-C
- UPC: 181969500029
- Caliber: 5.56 NATO
- Barrel Length: 11.5 inches
- Barrel Weight: 20.82 oz.
- Material: 4150 CMV steel
- Profile: M4
- Twist Rate: 1:7
- Gas System: Carbine-length
- Gas Block Journal: .750 inch
- Muzzle Threads: 1/2x28
- Crown: 11 degree
- Finish: Nitride, black
- Barrel Extension Finish: Nitride
Compatibility
- Fits AR-15-pattern upper receivers.
- Designed for 5.56 NATO ammunition and compatible .223 Remington ammunition.
- Accepts .750-inch low-profile or front sight base gas blocks.
- Accepts 1/2x28 threaded muzzle devices intended for .22-caliber / 5.56 platforms.
Not Compatible
- Not intended for AR-10, LR-308, or other large-frame AR receiver platforms.
- Not compatible with gas blocks designed for journal diameters other than .750 inch.
- Not suitable for muzzle devices using thread pitches other than 1/2x28 without an appropriate adapter.
Important Notes
- An 11.5-inch barrel may be used only in configurations compliant with all federal, state, and local laws.
- Professional installation and proper headspace verification are recommended.
- Confirm gas block, gas tube, muzzle device, handguard, and receiver compatibility before installation.
Frequently Asked Questions
Is this barrel compatible with a standard AR-15 upper receiver?
Yes. This Rosco Bloodline barrel is designed for standard AR-15-pattern upper receivers.
What gas system does this 11.5-inch barrel use?
It uses a carbine-length gas system and requires a compatible carbine-length gas tube.
What size gas block fits this barrel?
The barrel has a .750-inch gas block journal and requires a .750-inch gas block.
What muzzle devices fit the barrel?
The muzzle is threaded 1/2x28, the common thread pitch for many 5.56 NATO and .223-caliber AR-15 muzzle devices.
Can this barrel fire .223 Remington ammunition?
Yes. A barrel chambered in 5.56 NATO can safely fire both 5.56 NATO and .223 Remington ammunition.
What does the 1:7 twist rate mean?
The rifling completes one full rotation in seven inches. This twist rate is widely used for stabilizing common 5.56 NATO projectile weights.
Is this a complete upper receiver?
No. This product is a barrel only and requires compatible AR-15 components for a complete build.
For builders seeking a compact 5.56 NATO AR-15 barrel with durable materials, practical dimensions, and proven component compatibility, the Rosco Bloodline 11.5-inch M4 Profile Barrel is a strong foundation for a properly configured carbine, SBR, or pistol build.