Rosco Manufacturing Bloodline 11.5" M4 Barrel 5.56 NATO 1/7 Twist
Rosco Manufacturing
$137.70
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Rosco Manufacturing
Rosco Manufacturing Bloodline 11.5" M4 Barrel 5.56 NATO 1/7 Twist
The Rosco Manufacturing Bloodline 11.5" M4 Barrel in 5.56 NATO delivers purpose-built SBR and pistol-build performance, engineered from the ground up to meet the demands of the modern carbine shooter — not yesterday's sporter specs.
- 11.5" M4 profile barrel machined from mil-spec 4150 Chrome Moly Vanadium steel
- 1/7 twist rate optimizes stabilization for heavier 5.56 NATO projectiles
- Gas port diameter precision-tuned for reliable cycling in SBR-length configurations
- Engineered dwell time management ensures consistent function suppressed or unsuppressed
- M4 barrel profile balances weight and heat dissipation for sustained fire performance
- Chambered in 5.56 NATO for broad ammunition compatibility including .223 Remington
Who This Is For
This barrel is the ideal choice for AR-15 pistol builders, NFA-registered SBR owners, and tactical shooters who want a compact, high-reliability setup without sacrificing cycling performance. Whether you're running a suppressor on a home-defense build or putting together a lightweight patrol carbine, Rosco's Bloodline line is engineered to run hard in demanding conditions.
Specifications
| Brand | Rosco Manufacturing |
|---|---|
| Series | Bloodline |
| Barrel Length | 11.5" |
| Caliber | 5.56 NATO / .223 Rem |
| Twist Rate | 1:7" |
| Barrel Profile | M4 |
| Barrel Material | 4150 Chrome Moly Vanadium (CMV) |
| Barrel Weight | 20.82 oz |
| Gas System | Pistol Length |
| Platform | AR-15 |
| NFA Status | NFA Rules Apply (SBR / Pistol) |
Frequently Asked Questions
Does this barrel require NFA registration?
Yes. At 11.5 inches, this barrel falls below the 16" legal minimum for a rifle barrel. If installed on a rifle receiver, the firearm must be registered as a Short-Barreled Rifle (SBR) with the ATF and all applicable NFA rules apply. It can also be legally used on an AR-15 pistol build, provided the firearm meets pistol configuration requirements. Always verify compliance with federal and local regulations before purchasing or building.
Will this barrel work suppressed, and what gas system does it use?
Absolutely. The Rosco Bloodline 11.5" barrel is specifically engineered with optimized dwell time and gas port diameter to cycle reliably in suppressed configurations. It uses a pistol-length gas system, which is standard for this barrel length and helps manage the increased backpressure common when running a suppressor. Pairing it with an adjustable gas block is recommended for fine-tuning suppressed performance.
What upper receiver and handguard components are compatible with this barrel?
This barrel is designed for standard AR-15 upper receivers with a mil-spec extension diameter. It features a standard M4 profile and accepts most carbine-compatible handguards. Because of its 11.5" length, you'll typically want a 9" to 10" free-float handguard for optimal coverage and mounting options. The standard barrel nut threading ensures broad compatibility with most aftermarket handguard systems on the market.
