Rosco Manufacturing Bloodline 5.56 AR-15 Barrel Government Mid-Length - 14.5"

Manufactured by Rosco Manufacturing
SKU: BL-145-GVT-556-7-M
MPN: BL-145-GVT-556-7-M
Manufactured by Rosco Manufacturing
8 Reviews

In Stock

Orders of non-FFL items will ship same-day if placed before 3:30pm CST (M-F). FFL orders will ship within 5 business days if transfer details are provided.

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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.

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.

  • 14.5" 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 14.5" 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 Length14.5
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

8 reviews


Excellent fit, finish, and quality

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Rosco barrels are some of the best and most well-made barrels. They deliver an exceptional barrel at a great price. I’ve used these in multiple builds and continue to be impressed by the accuracy of these barrels.

I want to buy another

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No problem with fit or finish. Can't beat the value. would recommend to a friend.

Great barrel

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I've got two or three Roscoe barrels and am impressed with the quality for the price. They are Great. 👍👍

Roscoe 14.5

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Wow! Very nice barrel. Only complaint is there is a thin spot in the nitride on underside. But after shooting it did not bother me anymore. First 3 shots from this new barrel went into 3/4" @100 yd. w/Hornady 75gr Interlocks. Next, green tip went into an inch. Next, Hornady frontier 62 gr soft points went into less than an inch. Pinned/welded YHM low profile flash hider, fits barrel profile and finish perfect. And, it works well.
The combo is outstanding. So impressed I put the Roscoe sticker on my truck...

It's a shooter

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Only reason why I didn't give this barrel 5 stars is that there were some imperfections on the surface finish just in-front of the gas block. Not a big deal as it is completely covered by my handguard. Only been out to the range once so far, but shooting with iron sights it hits where I'm aiming. From a bench, I was able to hold a 2" group at 50yards which is likely my limit with iron sights (recreational shooter). Very impressed with the handling of the shorter barrel and accuracy. Wouldn't hesitate to buy this again.

Love this barrel


All Machining was spot on , feed ramps matched up perfect.


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Can’t beat this barrel for the price!

Crooked barrel

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Crooked barrel.
Contacted Rosco.

Thanks for your comment. Hope you're satisfied with the replacement barrel.