Rosco Bloodline 5.56 NATO 16″ M4 Carbine Barrel



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Rosco Bloodline 5.56 NATO 16″ M4 Carbine Barrel

Rosco Bloodline 5.56 NATO 16″ M4 Carbine barrel is designed to meet the modern day carbine shooters requirements. Rosco barrels are a long way from your daddy’s “Sporter” AR, and those specs just won’t cut it anymore.  From properly managed dwell times for SBR’s, to running Suppressed, or setting up a balanced patrol carbine we have incorporated your needs into our engineering. Rosco Manufacturing has accomplished this by picking the right twist rates, gas port diameters, and barrel materials according to the barrel we are making (not a lazy blanket method).  They have balanced input from their consumers and military end users in order to bring you the product you need, not just the one we want to sell you.

Rosco Manufacturing Bloodline series is their hardest working barrel.  Whether you are an occasional builder, tactical shooter, or Law Enforcement Officer, Rosco has a barrel that will fit your needs.  All of the Bloodline barrels are made from scratch in their Rhode Island facility and start life as a blank piece of steel. The Rosco Manufacturing Bloodline 5.56 NATO 16″ M4 Carbine barrel is machined from 4150 CMV steel, 1:7 twist, features an 11 degree crown, .750 gas block journal, carbine length gas, and finished in Black Nitride.

Arm or Ally is proud to add Rosco Manufacturing to our wide selection of AR Barrels from Ballistic Advantage and Faxon.  If you just starting to build your own custom rifle, see our our growing selection of AR parts, to include receivers, bolt carrier groups, muzzle devices, and more in our AR parts department. Are you a reloader, or considering becoming one? We offer a large selection of bullets and brass to choose from.

Product Information

Manufacturer: Rosco Manufacturing
Series: Bloodline
Profile: M4
Part #: BL-16-M4-556-7-C
Caliber: 5.56 NATO
Length: 16″
Material: 4150 CMV
Finish: Black Nitride
Gas System Length: Carbine Length
Gas Block Diameter: .750″
Twist Rate: 1:7 inches
Muzzle: 1/2 x 28 threaded
Weight: 28.97 oz
MSRP: $150.00

Weight 29 oz
Dimensions 17 × 3 × 2 in
Barrel Finish

QPQ Nitride

Gas Block Diameter


Gas System


Muzzle Thread

1/2 x 28

Barrel Length



5.56 NATO


Rosco Manufacturing


4150 Chrome Moly Vanadium

Part Type

Barrel, Upper Receiver Parts





Twist Rate


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