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Questions & Answers
Is this barrel chromelined Manufacturer Answer

All Bloodline barrels are 4150 Chromemoly Vanadium Steel and made here in the US.

by OPMOD, Manufacturer, January 3, 2023
On Roscos website it says their 13.9 is carbine length gas system. Are these actually mid length or are they carbine length? Are these barrels dimpled Expert Answer

The Rosco OPMOD Bloodline 5.56mm Nato 13.9in Threaded Barrel features a mid-length gas system 0.750" diameter. They are not dimpled from the factory.

by Ethan, Gear Expert, July 11, 2022
Customer Reviews
Helpful Positive Review
Great barrel, but even better price by RCD, Verified Owner, August 16, 2023
This is a well machined barrel. I was very surprised given the price. I had not owned a Rosco barrel before making this purchase, but I would definitely again. The machining is excellent, as well as the finish. Perfect fit into the upper. Can't say e...
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1/1 found this helpful
Helpful Positive Review
underrated by Jason Edwards, Verified Owner, May 18, 2023
This is my second barrel from OP. The first one has over 1000 rounds. And is paired with a BCM upper and standard BCM gas block. H buffer. NOX9 pin n weld. And it shoots very smooth and flat. 1.5 MOA with 55gr Winchester white box. Group tight...
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1/1 found this helpful
Helpful Positive Review
great for price by Jason Edwards, Verified Owner, February 18, 2023
Bought through OpticsPlanet. Showed up on time packed well. Barrel was dimpled for gas block. Used a NOX9 pin & weld. Only have about 500 rounds through it so far. Seems to be a good barrel so far. Feed ramps looked good. Mine shoots very flat...
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3/4 found this helpful
Helpful Positive Review
Love it, can’t beat it by Hexx, October 24, 2022
Look no further this barrel is amazing from the finish to function this thing is killer for the price you really cannot beat it I love it. I don’t think I have purchased a barrel I liked more at this price range
2/2 found this helpful
Helpful Positive Review
Solid Barrel for a Decent Price by Marcus, Verified Owner, July 27, 2022
Good barrel, feed ramps line up good. The length is great for pin and weld. The crown is well done and the finish overall is fantastic. Accuracy is pretty good, I haven’t shot for serious groups but it is about 2 MOA with cheap PMC bronze. My only is...
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3/3 found this helpful
Helpful Positive Review
Rosco 13.9 mid length by King, Verified Owner, July 15, 2022
This barrel is a Rosco 13.9 barrel that is mid length gas system. And the barrel is dimpled for a gas block (don’t know who answered my question above, but they’re wrong). Haven’t shot it yet so can say how good the accuracy is, but it’s exactly what...
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9/10 found this helpful
Read All 8 Reviews
Color:
Black
Finish:
Nitride
Fabric/Material:
4150 CMV
Caliber:
5.56x45mm NATO
Barrel Length:
13.9 in
Barrel Profile:
M4
Gas System Length:
Mid Length
Gas Block Journal Size-Diameter:
.750 in
Barrel Twist Rate:
1-7
Gun Make:
AR Platform
Gun Model:
AR-15
Weight:
26.34 oz
Condition:
Used
Condition Quality:
Fair
Condition Details:
Installed/Mounted
Gun Type:
Rifle
Threads per Inch:
1/2x28

Code: 99-ATB-PD1-BL-1395-GVT-556-7-M-EDEMO4

MPN: BL-1395-GVT-556-7-M-EDEMO4

Product No Longer Available

Product Info for Rosco OPMOD Bloodline 5.56mm Nato 13.9in Threaded Barrel

This 13.9in M4 5.56 NATO Mid-Length barrel was designed around the USASOC specs for an Improved Upper Receiver Group with a little bit of the Rosco 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. ALL NFA RULES APPLY!image

Their Rosco 5.56 (NATO) barrels are designed to meet the modern day carbine shooters requirements. They are a long way from their 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 they have incorporated your needs into their engineering. They have successfully accomplished this by picking the right twist rates, gas port diameters, and barrel materials according to the barrel they are making (not a lazy blanket method). They have also balanced input from their consumers and military end users in order to bring you the product you need, not just the one they want to sell you.

Package Contents:

  • Rosco OPMOD Bloodline 5.56mm Nato 13.9in Threaded Barrel

Gun Parts and Accessories

130 / 30
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Gunsmithing Tools & Accessories

115 / 15
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Magazine and Accessories

120 / 20
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Gun Triggers

115 / 15
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Gun Sights

119 / 19
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Gun Stocks

117 / 17
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Mounts, Rings and Accessories

119 / 19
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Rosco OPMOD Bloodline 5.56mm Nato 13.9in Threaded Barrel Unavailable & Discontinued Models

List of Unorderable Models

  • USED Rosco OPMOD Bloodline 5.56mm Nato 13.9in Threaded Barrel, Government, 1-7 Twist Rate, 1/2x28 TPI, Black Nitride, BL-1395-GVT-556-7-M, EDEMO4, Used, Condition Fair , MPN: BL-1395-GVT-556-7-M-EDEMO4 , Code: 99-ATB-PD1-BL-1395-GVT-556-7-M-EDEMO4
  • Rosco OPMOD Bloodline 5.56mm Nato 13.9in Threaded Barrel, Government, 1-7 Twist Rate, 1/2x28 TPI, Black Nitride, BL-1395-GVT-556-7-M , MPN: BL-1395-GVT-556-7-M , Code: 99-ATB-PD1-BL-1395-GVT-556-7-M
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Last updated 2026-07-20 UTC.