Rosco Manufacturing Bloodline 10.5 Inch Carbine AR 15 Barrel – 5.56 NATO

SKU: BL-105-M4-556-7-C

Click Here for Price
Out of Stock
We'll special order for you! Allow 3-5 days to Ship
AT3™ AR 15 Gas Tube & Carbine Gas Tube Length

AT3 Stainless Gas Tube with Roll Pins - Carbine Length


AT3™ Low Profile Micro Steel Gas Block - 4 Sizes Available

AT3™ Low Profile Micro Steel Gas Block - .750"


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 10.5 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 10.5 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.


  • 10.5″ 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: 10.5″
  • Barrel Weight: 19.28 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.


Caliber5.56 NATO/.223 Remington
Barrel Length10.5 inches
Barrel Twist Rate1:7 inches
Barrel Material4150 CMV
Muzzle Threads1/2/2028
Barrel FinishBlack Nitride
Gas Block Size.750″ Gas Block
Barrel ProfileGovernment
Barrel Gas SystemCarbine
Gas Block Journal Length1.9 inches
Barrel ExtensionM4
Weight19.28 ounces

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 3 reviews
Mike Jones
So good I bought another one

Really really high quality barrel. It's so good and such a high quality, I bought another one for my second sbr build

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

Jacob Turner
Great barrel

Just received the rosco 10.5” barrel a few days ago looks amazing felt really durable just installed it looks great will be finished with my build when my handguard comes in a few days can't wait.

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

Bill Conner
Great barrel

I'm excited about the new barrel. Will be finishing it as soon as the upper handguns combo comes in.

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