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Quality, mil-spec, match-grade. Only the finest 416R stainless and 4150 CMV AR 15 barrels.

The barrel is the heart of the AR platform. In such a refined weapon system with decades of optimizing performance, every land and groove in every cut of your rifling makes the difference between obtaining sub-MOA accuracy, and mimicking the embarrassment of  using an AK-47 to spray a barn-sized target downrange.

You want the former. That's why you're here. Because we only work with the country's top gunsmiths and firearm manufacturing to bring quality, US-forged and -cut AR-15 barrels that provide the utmost accuracy, reliability, and performance with any factory or hand load.

Not sure about twist rate or barrel length?: Read the AR-15 Barrel Guide.

Installing your barrel's easy! Here's the full, step-by-step picture guide with tools.

AR Barrel Features & Specs

  • All AR-15 barrels are cut and forged in the U.S.A.
  • Barrels batches are proof-tested for reliability and accuracy.
  • All stainless steel barrels made from Crucible 416R stainless.
  • All carbon steel barrels made from 4150 CMV (mil-spec) steel.
  • All barrels fitted with mil-spec chambers and M4 feed ramps.
  • All barrels guaranteed to fit any available AR upper stripped uppers.

Pistol-length vs. Rifle-length barrels

PLEASE NOTE: It is not legal to install an AR-15 barrel shorter than 16" on an AR-type firearm equipped with a buttstock, unless you have properly filed the necessary ATF application to build an SBR (short-barreled rifle), and you were approved by the ATF first. Read our in-depth guide to do it all here.

Without ATF approval, you should only install a barrel shorter than 16" on an AR-15 or other firearm that is not equipped with any type of shoulder stock or other device which may be considered a stock by the ATF.


DISCLAIMER: If you are new to the world of DIY gun building, you likely have a lot of questions and rightfully so. It’s an area that has a lot of questions that, without the correct answers, could have some serious implications. At 80-Lower.com, we are by no means providing this content on our website to serve as legal advice or legal counsel. We encourage each and every builder to perform their own research around their respective State laws as well as educating themselves on the Federal laws. When performing your own research, please be sure that you are getting your information from a reliable source.

We are a national retailer of individual components and not all products depicted on this website are legal in every state. Shipping of various products found on this website are prohibited to some states (such as California, Connecticut, District of Columbia, Hawaii, New Jersey, New York, Rhode Island, and Washington). The information, pictures, text or products presented on this website are not a representation by us, and should not be understood by you, that any product or completed firearm is legal to assemble or own in your state of residence. We encourage each and every builder to perform their own research about the state and federal laws that apply to them. It is your responsibility to understand the law and we encourage you to consult with an attorney or your local ATF representative.