FN America 5.56 Button Rifled Mid-Length Government AR-15 Barrel - 16"

Manufactured by FN America
SKU: 20-100041
MPN: 20-100041
Manufactured by FN America
14 Reviews

In Stock

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FN America’s 5.56x45mm AR-15 Barrel is a high-quality upgrade to any AR build. The 16” barrel features M16 styling with mil-spec steel construction and a black manganese phosphate finish. The mid-length barrel has a chrome lined chamber and M4 style feed ramps compatible with 5.56x45mm and .223 Remington that help extend barrel life while providing consistent, reliable feeding while shooting. It is threaded in 1/2x28 and has a 1:7 RH twist rate. 

Note: It is recommended that all FN America parts be installed by a qualified and trained gunsmith.

  • 16” barrel chambered in 5.56 / .223
  • Machined from mil-spec steel
  • Chrome lined chamber
  • M4 style feed ramps
  • Mid-length gas system
  • Threaded 1/2x28
  • Black Manganese Phosphate finish

FN America is a subsidiary of FN Herstal, a global company with a proud, long-standing heritage. They are committed to providing highest quality, dependable, innovative firearms. With an over 127-year history, Fabrique Nationale stands at the cutting-edge of commercial, law enforcement, and military weapons. Every one of FN America’s firearms are hand tested before leaving the factory to ensure reliability and make sure that the product you receive will work when you need it to.
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Barrel CoatingManganese Phosphate
Barrel Length16
Barrel MaterialSteel
BrandFN America
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 www.P65Warnings.ca.gov.

Ratings & Reviews

14 reviews

  • 3 stars
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  • 1 star
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Received 12/6/2020


Disregard last review....heavy park over rollmark and old eyes.


by -

I love my Barrel. It is awesome. Is it easy to install.

Fn Barrel

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Awesome deal fast service

Great product

by -

This is an FN quality barrel, simply put. Primary definitely has error when it says only chamber is chrome lined. I ran a bore scope it was chrome lined entirely. I would reference FN product page for better specification description. https://fnestore.com/ar15-barrel-16-bb-m16-556-midlength

Kinda pricey but good barrel


The description only says chrome lined chamber but it appears to be full chrome lined bore and chamber.

FN Barrel 16"

by -

Have not installed yet. I'm sure it will meet FN standards for quality.
<br>Purchased an FN509 Tactical and love that gun.

One awesome barrel


Got an email from PA back in October 2020 saying this barrel was on sale for 179.99 so I bought it. Arrived in the mail and looked great. Decided I would do another upper build. Bought an Anderson upper receiver and a BCM handguard to finish my build. FZ BCG and all is done. Took to the range and was shooting less than 1 inch groups at 100 yards. I couldn't believe it. I have heard people say that all ar barrels are the same. Not true! You get what you pay for. I would recommend this barrel to anyone.

Amazing Quality

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I purchased one of these barrels for a complete gun build I was doing. The chrome lining, pressure testing, and MPI were great. If it's good enough for military units it's more than good enough for me, this barrel is more accurate than I'll ever be. Since the barrel and bcg are the heart of the weapon I didn't want to skimp out on the Barrel.

Good purchase

by -

Good deal on a good barrel

Incredible build!

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Incredible build quilty, I will definitely buy again!