Rosco Mfg Bl-125-M4-556-7-C Bloodline 5.56 Nato 12.50" Nitride 4150 Cmv BrlRosco Manufacturing$154.80
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Rosco Manufacturing
The Rosco Manufacturing Bloodline 5.56 NATO 11.50" barrel is purpose-built for short-barreled rifle and pistol builds where barrel length, gas system tuning, and reliability under suppression matter. This 4150 Chrome-Moly Vanadium (CMV) barrel features a nitride finish for corrosion resistance and durability, with a .750" gas block journal designed to handle the specific dwell characteristics needed in compact platforms. Rosco engineered this barrel with SBR shooters, suppressed shooting, and pistol-caliber builds in mind—not generic one-size-fits-all specs.
At 11.50 inches, this barrel splits the difference between extreme compactness and enough length to keep velocities respectable for 5.56 rounds. The nitride treatment hardens the steel surface, extending the life of your bore and making cleaning easier. The gas port diameter and twist rate are selected specifically for the Bloodline line to promote reliable cycling with the shorter gas system typical of compact builds. Whether you're assembling a short-range defensive carbine, a suppressed precision setup, or a compact range gun, this barrel handles the thermal and pressure cycles of modern AR builds.
Rosco pulls from feedback from both civilian shooters and military users to dial in their barrel engineering—meaning this isn't a generic barrel warehouse commodity. The Bloodline is available in multiple configurations, but this specific model delivers the 11.50" M4-profile geometry in 5.56 NATO. Keep in mind that NFA regulations apply if you're building a short-barreled rifle; plan your overall length and stock configuration accordingly.
| Caliber | 5.56 NATO |
| Barrel Length | 11.50" |
| Material | 4150 Chrome-Moly Vanadium |
| Finish | Nitride |
| Gas Block Journal | .750" |
| Profile | M4 |
| Manufacturer | Rosco Manufacturing |
Yes. The .750" gas block journal is standard for M4-profile barrels and fits most AR-15 builds. However, confirm your gas tube length and overall rifle configuration, especially if you're building an SBR—those require careful dwell time management, which this barrel is designed to handle.
Yes. Rosco engineered the Bloodline with suppressed shooting in mind. The gas port diameter and barrel characteristics are tuned to manage the added back-pressure that suppressors create, promoting reliable cycling without over-gassing.
Nitride hardening strengthens the bore and exterior steel, improving corrosion resistance and extending barrel life. It also makes the barrel easier to clean and maintain, and resists the wear typical of frequent shooting and suppressor use.
Yes. At 11.50", this barrel will result in a short-barreled rifle (SBR) if used with a traditional stock on a complete firearm. NFA regulations apply—you'll need to register the firearm with the ATF and comply with all applicable federal and state laws. Verify your local regulations before building.
Rosco Manufacturing
The Rosco Manufacturing Bloodline 5.56 NATO 11.50" barrel is purpose-built for short-barreled rifle and pistol builds where barrel length, gas system tuning, and reliability under suppression matter. This 4150 Chrome-Moly Vanadium (CMV) barrel features a nitride finish for corrosion resistance and durability, with a .750" gas block journal designed to handle the specific dwell characteristics needed in compact platforms. Rosco engineered this barrel with SBR shooters, suppressed shooting, and pistol-caliber builds in mind—not generic one-size-fits-all specs.
At 11.50 inches, this barrel splits the difference between extreme compactness and enough length to keep velocities respectable for 5.56 rounds. The nitride treatment hardens the steel surface, extending the life of your bore and making cleaning easier. The gas port diameter and twist rate are selected specifically for the Bloodline line to promote reliable cycling with the shorter gas system typical of compact builds. Whether you're assembling a short-range defensive carbine, a suppressed precision setup, or a compact range gun, this barrel handles the thermal and pressure cycles of modern AR builds.
Rosco pulls from feedback from both civilian shooters and military users to dial in their barrel engineering—meaning this isn't a generic barrel warehouse commodity. The Bloodline is available in multiple configurations, but this specific model delivers the 11.50" M4-profile geometry in 5.56 NATO. Keep in mind that NFA regulations apply if you're building a short-barreled rifle; plan your overall length and stock configuration accordingly.
| Caliber | 5.56 NATO |
| Barrel Length | 11.50" |
| Material | 4150 Chrome-Moly Vanadium |
| Finish | Nitride |
| Gas Block Journal | .750" |
| Profile | M4 |
| Manufacturer | Rosco Manufacturing |
Yes. The .750" gas block journal is standard for M4-profile barrels and fits most AR-15 builds. However, confirm your gas tube length and overall rifle configuration, especially if you're building an SBR—those require careful dwell time management, which this barrel is designed to handle.
Yes. Rosco engineered the Bloodline with suppressed shooting in mind. The gas port diameter and barrel characteristics are tuned to manage the added back-pressure that suppressors create, promoting reliable cycling without over-gassing.
Nitride hardening strengthens the bore and exterior steel, improving corrosion resistance and extending barrel life. It also makes the barrel easier to clean and maintain, and resists the wear typical of frequent shooting and suppressor use.
Yes. At 11.50", this barrel will result in a short-barreled rifle (SBR) if used with a traditional stock on a complete firearm. NFA regulations apply—you'll need to register the firearm with the ATF and comply with all applicable federal and state laws. Verify your local regulations before building.