Rosco 11.5″ M4 Profile 5.56 NATO Bloodline Barrel – Carbine-Length Gas
Compact, rugged, and engineered for modern tactical applications, the Rosco Bloodline 11.5″ M4 barrel is the ideal foundation for your next SBR or AR pistol build. Chambered in 5.56 NATO and machined from 4150 CMV steel, this barrel features a nitride finish for enhanced corrosion resistance and durability under high round counts.
Rosco’s engineering focuses on real-world performance—balancing dwell time, gas port sizing, and twist rate to optimize suppressed shooting, patrol carbines, and high-reliability platforms. Whether you’re building for duty use or personal defense, this barrel delivers the precision and dependability demanded by professionals and enthusiasts alike.
Note: ALL NFA RULES APPLY when using this barrel in SBR or pistol configurations.
4150 CMV Steel ConstructionDelivers high strength and heat resistance for sustained performance.
Nitride FinishProvides corrosion resistance and a sleek, low-maintenance surface.
M4 ProfileClassic contour balances weight and rigidity for versatile use.
Carbine-Length Gas SystemEnsures reliable cycling and smooth recoil impulse in short-barreled setups.
11° Target CrownEnhances bullet exit consistency for improved accuracy.
1:7 Twist RateIdeal for stabilizing heavier projectiles and maximizing ballistic performance.
1/2×28 Threaded MuzzleCompatible with a wide range of muzzle devices and suppressors.
Nitride-Coated Barrel ExtensionImproves feeding reliability and resists fouling.
Optimized for Suppressed UseEngineered with properly sized gas ports for balanced performance.
Specifications
- Chamber: 5.56 NATO
- Barrel Length: 11.5 inches
- Material: 4150 Chrome Moly Vanadium Steel
- Profile: M4
- Finish: Nitride
- Twist Rate: 1:7
- Gas System Length: Carbine
- Gas Block Journal: .750 inches
- Muzzle Threads: 1/2 × 28 TPI
- Crown: 11° Target Crown
- Barrel Extension Finish: Nitride
- Weight: 20.82 oz
