Rosco Manufacturing Bloodline 5.56 AR-15 Barrel Government Mid-length - 16"

Manufactured by Rosco Manufacturing
SKU: BL-16-GVT-556-7-M
MPN: BL-16-GVT-556-7-M
Manufactured by Rosco Manufacturing
10 Reviews

In Stock

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The AR-15 is by far the most dominant carbine on the market. To stand out, simply building 'good enough' components doesn't cut it. 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.


  • 16" Government contour
  • Mid-length gas system
  • 1/2x28 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

Rosco Manufacturing takes their barrels seriously. Rather than entrust someone else's blanks or machining, they produce every barrel from scratch, controlling every step of the manufacturing process. The Bloodline series is cut from high-strength 41V50 Chrome Moly Vanadium steel, the same stuff chosen for the rifles used by our military for its exceptional durability. Improving on the military-grade barrels, the Bloodline-series are finished with a highly corrosion resistant, low friction salt bath nitride treatment, making cleaning easier than ever. By producing these barrels entirely in house, they've also been able to tune each barrel by selecting the optimal twist rates, gas port diameters, dwell times, and materials according to the needs of each barrel.

This 16" barrel is machined to a balanced Government contour, offering a solid balance between rigidity and weight. The smooth shooting mid-length gas system ensures your rifle gets the optimal amount of gas for reliable cycling while offering smoother recoil characteristics. The 5.56 NATO chamber is fully compatible with .223 Remington ammunition, with a 1:7 twist rate that is perfect for heavier, precision-oriented cartridges, but is thoroughly functional with popular and less expensive bullet weights.

Rosco Manufacturing got their start producing high quality, hard-use precision rifle barrels. They have since expanded, offering their own line of serious use parts and accessories so you can assemble a rifle that doesn't just shoot good and look good, but will handle hard use as well. To top it off, they're production facility is in Central Falls, Rhode Island so you know that every component is 100% made in America, by Americans.
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Barrel CoatingSalt Bath Nitride
Barrel ContourGovernment
Barrel Length16
Barrel LiningSalt Bath Nitride
Barrel Material41V50 Chrome Moly Vanadium Steel
BrandRosco Manufacturing
Caliber Gauge5.56 NATO
Feed RampsM4
Gas Seat Diameter.750
Gas System LengthMid-Length
Thread Pattern1/2 X 28
Twist Rate1:7
California Prop 65 warning

 WARNING: This product can expose you to chemicals, which are known to the State of California to cause Cancer and Reproductive Harm. For more information go to

Ratings & Reviews

10 reviews

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Great barrel

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What a fantastic barrel, I just cannot believe the quality for the price.cannot comment on moa, but I'm sure it's there. I'll probably be purchasing another 1 to have on hand. PA is a great place to buy 4 all your needs, and shipping is insanely fast.

Very nice barrel!


I would and will buy again. Comes in 3 boxes. The shipping, a white one with flaps and your thinking “oh no, subpar”, then you pull out a nice two piece black box and then the feeling you get unboxing an apple product, like that. Inside it sits secured in foam blocks with two stickers which are high quality vinyl and a nice thank you card. Barrels laser etched with logo and specs and also pre dimpled for your gas block needs. If your thinking about it, it’s worth it. Haven’t shot it yet but for a company that holds military, law enforcement and big player gun maker contracts I’m sure it’ll be on target! Sorry, had to.


by -

This barrel is more accurate than I am. The finish is great and it comes pre-dimpled for the gas block set screws which makes installing your gas block a breeze


by -

This barrel was perfect exactly what I was looking for.

Dimpled for the win


Excellent nitrided barrel and PROPERLY gassed. Running a springco blue with Expo H3 buffer and its perfect ejection. Fit and finish is better than expected would definitely recommend.

Great Barrel

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First time purchase of this brand and I have to say they knock it out of the park. Looks, function all where needs to be. I will buy again

Badass barrel

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I had the 14.5" bloodline in carbine length and loved it, but got sick of arbitrary "pistol" attachment restrictions. Upgraded to 16" with mid-length gas system and it runs about the same, but now I can have a big boy rifle stock and a vertical grip between my mag and afg. Anyway, I'm really glad I decided to stick with the rosco barrel!

Truly impressed.

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I have a lot a AR's and this is the first Rosco barrel I have "knowingly" tried. Right off the bat I was immediately impressed with how well gassed this thing was. The second thing that amazed me was the accuracy of this barrel and the lack of flyers. For the price I really don't think you will find a better barrel on the market.

Excellent Barrel


Quality barrel, I got quarter sized 5 round groups at 25m from the prone unsupported with 55 grain, so as accurate as any decent AR barrel I've shot (daniel, colt, etc...). It ran fine with a carbine buffer so I would say its gassed well. To top it off, its pre-dimpled.

Would buy again

by -

Heard very good things about Rosco barrels. This is my first barrel from Rosco, went to dimple the barrel and went too deep which is my fault. This barrel is softer than Aero or Ballistic. Still a good quality barrel for a great price. Primary Arms is always top notch with prices and customer service!