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Rosco Manufacturing Bloodline 5.56 NATO Mid Length Barrel Up to 10% Off — Free 2 Day Shipping w/ code 2DAYAIR — 2 models

Special offer available for this product. Click here to see!
Rosco Manufacturing Bloodline OPMOD 5.56 NATO Mid Length Barrel
Rosco Manufacturing Bloodline 5.56 NATO Barrel, M4, 14.5in, Mid Length, 1-7 Twist, 1/2x28 Thread, Nitride, Black, BL-145-GVT-556-7-M
Rosco Manufacturing Bloodline 5.56 NATO Barrel, M4, 16in, Mid Length, 1-7 Twist, 1/2x28 Thread, Nitride, Black, BL-16-GVT-556-7-M
Rosco Manufacturing Bloodline 5.56 NATO Barrel, M4, 14.5in, Mid Length, 1-7 Twist, 1/2x28 Thread, Nitride, Black, BL-145-GVT-556-7-M
Rosco Manufacturing Bloodline 5.56 NATO Barrel, M4, 14.5in, Mid Length, 1-7 Twist, 1/2x28 Thread, Nitride, Black, BL-145-GVT-556-7-M
Rosco Manufacturing Bloodline 5.56 NATO Barrel, M4, 14.5in, Mid Length, 1-7 Twist, 1/2x28 Thread, Nitride, Black, BL-145-GVT-556-7-M
Rosco Manufacturing Bloodline 5.56 NATO Barrel, M4, 16in, Mid Length, 1-7 Twist, 1/2x28 Thread, Nitride, Black, BL-16-GVT-556-7-M
Rosco Manufacturing Bloodline OPMOD 5.56 NATO Mid Length Barrel
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Rosco Manufacturing Bloodline OPMOD 5.56 NATO Mid Length Barrel
Rosco Manufacturing Bloodline 5.56 NATO Barrel, M4, 14.5in, Mid Length, 1-7 Twist, 1/2x28 Thread, Nitride, Black, BL-145-GVT-556-7-M
2 of 7 images
Rosco Manufacturing Bloodline 5.56 NATO Barrel, M4, 14.5in, Mid Length, 1-7 Twist, 1/2x28 Thread, Nitride, Black, BL-145-GVT-556-7-M
Rosco Manufacturing Bloodline 5.56 NATO Barrel, M4, 16in, Mid Length, 1-7 Twist, 1/2x28 Thread, Nitride, Black, BL-16-GVT-556-7-M
3 of 7 images
Rosco Manufacturing Bloodline 5.56 NATO Barrel, M4, 16in, Mid Length, 1-7 Twist, 1/2x28 Thread, Nitride, Black, BL-16-GVT-556-7-M
Rosco Manufacturing Bloodline 5.56 NATO Barrel, M4, 14.5in, Mid Length, 1-7 Twist, 1/2x28 Thread, Nitride, Black, BL-145-GVT-556-7-M
4 of 7 images
Rosco Manufacturing Bloodline 5.56 NATO Barrel, M4, 14.5in, Mid Length, 1-7 Twist, 1/2x28 Thread, Nitride, Black, BL-145-GVT-556-7-M
Rosco Manufacturing Bloodline 5.56 NATO Barrel, M4, 14.5in, Mid Length, 1-7 Twist, 1/2x28 Thread, Nitride, Black, BL-145-GVT-556-7-M
5 of 7 images
Rosco Manufacturing Bloodline 5.56 NATO Barrel, M4, 14.5in, Mid Length, 1-7 Twist, 1/2x28 Thread, Nitride, Black, BL-145-GVT-556-7-M
Rosco Manufacturing Bloodline 5.56 NATO Barrel, M4, 14.5in, Mid Length, 1-7 Twist, 1/2x28 Thread, Nitride, Black, BL-145-GVT-556-7-M
6 of 7 images
Rosco Manufacturing Bloodline 5.56 NATO Barrel, M4, 14.5in, Mid Length, 1-7 Twist, 1/2x28 Thread, Nitride, Black, BL-145-GVT-556-7-M
Rosco Manufacturing Bloodline 5.56 NATO Barrel, M4, 16in, Mid Length, 1-7 Twist, 1/2x28 Thread, Nitride, Black, BL-16-GVT-556-7-M
7 of 7 images
Rosco Manufacturing Bloodline 5.56 NATO Barrel, M4, 16in, Mid Length, 1-7 Twist, 1/2x28 Thread, Nitride, Black, BL-16-GVT-556-7-M

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Questions & Answers
is this barrel dimpled? Manufacturer Answer

Yes, all Rosco barrels are dimpled for proper gas block alignment and ease of installation.

by Rosco Customer Service, Manufacturer, April 17, 2025
See 1 More Answer
Is the gas port pinned? Expert Answer

Unfortunately, Rosco Manufacturing does not list that specification.

You can reach Roscoe at 401-228-0120, or by email at sales@roscomanufacturing.com

Mark H.

by Mark H., Gear Expert, September 24, 2019
View All Q&A You Have a Question? Ask!
Customer Reviews
Helpful Positive Review
Good Quality by PP, Verified Owner, September 17, 2023
Great presentation and finish quality, installed on an aero precision Upper and fit perfect, no test fire yet, I Order a second barrel after install this one. Purchase other 3 barrels from other brands and the looks and felt cheap after received the...
Read More...
1/1 found this helpful
Helpful Positive Review
Product exceeded expectations in every way. by BigAl, July 28, 2025
Admittedly, I had almost zero expectations for this barrel, especially at this price point. But I had a 16” B.Rain that wouldn’t group, so I purchased this barrel on sale to try a 14.5 P/W thinking I wouldn’t be out much if I hated it. First off, se...
Read More...
1/1 found this helpful
Helpful Positive Review
Great barrel by Kyle, August 23, 2019
As good as a Bcm barrel but half the price. Get the 14.5 and pin it. They always look way better. My 16 is fine I just wish I would have done 14.5. SS is only 10$ more that will be my next purchase as well
4/9 found this helpful
Helpful Positive Review
Sick Barrel by Meatbag79, Verified Owner, March 3, 2020
This is the fastest item that has ever shipped for any firearm. It’s also the best barrel. Rosco has a fantastic product. I love that it comes dimpled for the gas block, and it is shipped in heavy duty packaging. 5 stars.
2/2 found this helpful
Helpful Positive Review
Rosco 16" mid barrel by James, February 25, 2022
The barrel is nice and looks well made. The dimple for the gas block screw made alignment easy. After putting a few hundred rounds through the barrel it has been reliable and I have had zero issues. I cannot speak to absolute accuracy yet as I have n...
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Most Recent Reviews
Awesome Barrel! by Shane, Verified Owner, December 11, 2025
My first time replacing a barrel on an AR, just wanted it a little bit shorter. Shoots better now than it did with the original 16" barrel. Added a 2" brake to take it to legal length. After seeing it shoot, ordered a second one for a new build. Don'...
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Product Info for Rosco Manufacturing Bloodline 5.56 NATO Mid Length Barrel

This barrel was designed around the USASOC specs for an Improved Upper Receiver Group with a little bit of the Rosco Manufacturing touch as well. The longer gas system allows for a smoother gas curve which leads to managed dwell times. This combo creates a great balance of speed and performance.image

Rosco Manufacturing 5.56 (NATO) barrels are designed to meet the modern day carbine shooters requirements. We are a long way from our daddys Sporter AR, and those specs just wont cut it anymore. From properly managed dwell times for SBRs, to running Suppressed, or setting up a balanced patrol carbine Rosco Manufacturing have incorporated your needs into our engineering. Rosco Manufacturing have successfully accomplished this by picking the right twist rates, gas port diameters, and barrel materials according to the barrel Rosco Manufacturing are making (not a lazy blanket method). Rosco Manufacturing have also balanced input from our consumers and military end users in order to bring you the product you need, not just the one Rosco Manufacturing want to sell you.

Specifications for Rosco Manufacturing Bloodline 5.56 NATO Mid Length Barrel:

Manufacturer: Rosco Manufacturing
Color: Black
Fabric/Material: 4150 CMV Material
Caliber: 5.56x45mm NATO
Gas System Length: Mid Length
Gas Block Journal Size-Diameter: .750 in
Barrel Twist Rate: 1-7
Barrel Material: 4150 Chrome Moly Vanadium
Flutes: No
Gun Make: AR Platform
Gun Model: AR-15
Condition: New
Gas Block Journal Size-Length: .750 in
Gun Type: Rifle
Firearms Threads Per Inch: 1/2x28
Country of Origin: USA
Gas System: Mid Length

Features of Rosco Manufacturing Bloodline Barrel, Government Profile, 5.56 NATO

  • Gas Block Size .750
  • Barrel Crown 11 Degree

Package Contents:

  • Rosco Manufacturing Bloodline Barrel, Government Profile, 5.56 NATO

What firearm models does the manufacturer say Rosco Manufacturing Bloodline 5.56 NATO Mid Length Barrel is compatible with?

The manufacturer says that Rosco Manufacturing Bloodline 5.56 NATO Mid Length Barrel is compatible with AR-15

Rosco Manufacturing Bloodline 5.56 NATO Mid Length Barrel Orderable Models

List of Orderable Models

  • Rosco Manufacturing Bloodline 5.56 NATO Barrel, M4, 14.5in, Mid Length, 1-7 Twist, 1/2x28 Thread, Nitride, Black, BL-145-GVT-556-7-M , MPN: BL-145-GVT-556-7-M , UPC: 181969500050 , Code: 3FY-ATB-ROMB004-BL-145-GVT-556-7-M
  • Rosco Manufacturing Bloodline 5.56 NATO Barrel, M4, 16in, Mid Length, 1-7 Twist, 1/2x28 Thread, Nitride, Black, BL-16-GVT-556-7-M , MPN: BL-16-GVT-556-7-M , UPC: 181969500074 , Code: 3FY-ATB-ROMB004-BL-16-GVT-556-7-M

Rosco Manufacturing Bloodline 5.56 NATO Mid Length Barrel Unavailable & Discontinued Models

List of Unorderable Models

  • Rosco OPMOD Bloodline 5.56mm Nato 13.9in Threaded Barrel, Government, 1-7 Twist Rate, 1/2x28 TPI, Black Nitride , MPN: BL-1395-GVT-556-7-M-KIT2023 , Code: 3FY-ATB-ROMB004-BL-1395-GVT-556-7-M-KIT2023
  • USED, Rosco Manufacturing Bloodline 5.56 NATO Barrel, M4, 16in, Mid Length, 1-7 Twist, 1/2x28 Thread, Nitride, Black, BL-16-GVT-556-7-M , MPN: BL-16-GVT-556-7-M-EDEMO , Code: 3FY-ATB-ROMB004-BL-16-GVT-556-7-M-EDEMO-OB-C
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