Rosco Manufacturing Bloodline 11.5 Inch Carbine Barrel – 5.56 NATO

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Perfect Addition To Any SBR or Pistol Build For Modern Day Shooters

The Bloodline series of barrels was designed and built entirely in-house by Rosco Manufacturing with the sole purpose of providing you with a barrel that will not only outperform the competition but outlast it too. The Bloodline 11.5 Inch Carbine Barrel 556 is designed to be the perfect addition to any SBR or Pistol build to meet the modern-day carbine shooters requirements

Rosco has successfully incorporated setting up a balanced patrol carbine that managed dwell times for SBR’s to running Suppressed. This barrel offers the right twist rates, gas port diameters, and barrel materials that will take your rifle to the next level of performance.

Designed To Fit Every Shooter’s Needs

The Bloodline 11.5 Inch Carbine Barrel 556 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.

Whether you are an occasional builder, tactical shooter, or Law Enforcement Officer, this Bloodline barrel is the ideal option to provide you the flexibility and reliability you need for your AR build.


  • 11.5″ Government contour
  • Carbine length gas system
  • 1/2×28 threading with 11-degree crown
  • 1:7 twist flexible round selection
  • 41V50 Chrome Moly Vanadium steel
  • Corrosion-resistant salt bath nitride finish
  • Slick nitride-finished M4 barrel extension
  • Compatible with standard .750″ gas blocks
  • 5.56 NATO chamber


  • Barrel Length: 11.5″
  • Barrel Weight: 20.82 Oz
  • Barrel Material: 4150 CMV
  • Barrel Caliber: 5.56
  • Barrel Profile: M4
  • Twist: 1/7
  • Barrel Thread: 1/2 x 28
  • Gas Block Size: .750
  • Gas System Length: Carbine
  • Barrel Crown: 11 Degree
  • Barrel Finish: Nitride
  • Barrel Extension Finish: Nitride

Note: The National Firearms Act regulates the configurations of some firearms assembled with barrels under 16” long. Know the NFA laws in your state before purchasing this item.

Have Questions About this Product?

The AT3 Tactical store has a 90 day no-hassle return policy for products in good condition. You can view the full details of our return policy here.

If you encounter an issue or defect with a product after 90 days of your purchase, you can refer to the manufacturer for a warranty claim. Their policies are below.

Rosco Manufacturing Returns & Warranty

  • Rosco Manufacturing prides itself on creating a well-made product and taking care of its customers. That being the case we will warranty against any defects stemming from manufacturing, or if you received the incorrect part.
  • To be eligible for a return, the customer must contact our Customer Service/ Sales Department and make them aware of the issue first. If the issue is related to a technical matter, we will try and resolve it by troubleshooting before we exchange the product or issue a return/ refund.
  • If a return is authorized, we will send a shipping label to the customer to use and send the item back to us. The item must be in the original packaging and have the receipt or proof of purchase in the box.

In the event that you receive a product that you changed your mind about or your build needs have changed, we will extend you the following refund policy:

  • The original customer has 30 calendar days to return an item from the date they received it, with no exceptions.
  • To be eligible for a return, your item must be unused and in the same condition that you received it.
  • The item must be in the original packaging and have the receipt or proof of purchase in the box.
  • We ultimately still hold the right to deny a return if terms are not met, or there are other determining factors that prompt us to deny one.


  • Once we receive the item back, we will inspect it and notify you that we have received the returned item.
  • We will immediately notify you of the status of your new product or refund after inspecting the item.
  • If your return is approved, we will send you a new product or initiate a refund to your credit card (or original method of payment) minus a 10% restocking fee (depending on the reason for return).
  • You should receive the credit within a certain amount of days, depending on your card issuer’s policies.

Contact Details:

  • Telephone: 401-228-0120
  • Email:

Disclaimer: Manufacturer’s warranty is subject to change without prior notice.

Customer Reviews

Based on 4 reviews
Jacob Turner
Great barrel

Second one I've bought because I love their barrels because they are great barrels.

Thanks for sharing your feedback! We're glad you're satisfied with your purchase. Cheers!

John chavez
Bloodline barrel

Never tried this brand of barrel but heard a lot good things about them so I picked one up and I absolutely love it.. amazing quality, dimpled for the gas block and super accurate at 100yds hoping to stretch its legs a bit this weekend but it truly is a performer.. I highly recommend this product..

Great review! We're glad to hear that you love the quality and accuracy of the Bloodline barrel. Thanks for letting us know!

Nathan Crown

Love the bloodline barrels , this is my second build with a rosco bloodline barrel and there fantastic!

Thanks for sharing your feedback! We're glad you're satisfied with your purchase. Cheers!

amazing product!

clean packaging and beautiful barrel, and even has set screw indentation for gas block unlike many of my other barrel purchases from Aero/PSA. Obviously not essential, but a niiiice touch. will definitely shop Rosco on my future builds. A+++

Thanks for sharing your feedback! We're glad you're satisfied with your purchase. Cheers!