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Mil-spec, 4150 CMV-forged barrels for superior barrel life and accuracy.

If it ain't broke, don't fix it. That's why we've stuck with offering the tried n' true M4-type/Government-profile AR-15 barrel, professionally forged and cut-rifled from proper, heat-treated 4150 CMV gun steel. Sporting the minimum legal length of 16", this barrel meets the requirements for building your own AR-15 rifle at home without the need to file any NFA paperwork (military-issued M4s sport a 14.5" barrel).

Confused about barrel steel? Read our complete guide to AR-15 barrels.

All Our Barrels Are Made from CMV or 416R Stainless

"Cheap" barrels are often forged from softer 4140 steel, while typical commercial barrels are made from standard 4150. Real, mil-spec barrel steel (properly called "CMV" or Chomoly Vanadium) provides additional hardness and protection against wear from high heat and rapid fire, without sacrificing accuracy or range. 

All stainless barrels and barreled uppers and kits we sell are exclusively forged from 416R Crucible stainless, a proprietary barrel steel designed for incredible precision in all hot- and cold-weather environments. These match-grade barrels are capable of providing sub-MOA accuracy in a compact platform. 

Phosphated, Nitrided and Chrome-Lined for Corrosion and Wear

All carbon steel barrels are phosphate-coated or nitride-treated to protect against corrosion, rust, and external wear, just as any mil-spec, issued barrel is coated. Each carbon barrel is chrome-lined to further protect against heat and rifling wear, greatly enhancing barrel life without sacrificing accuracy downrange. Our stainless barrels (found on available barreled upper assemblies) are made from 416R Crucible stainless, a superior alloy that provides easy cleaning, incredible wear resistance, and high accuracy. Pair your barrel up with a quality, free-float handguard (barrel nut included!) with a stripped upper and you're ready to build.

Ready to assemble? Here's how to install your new barrel, gas, and handguard.


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 GunBuilders.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.