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Upper Receiver

Upper Receiver

One mil-spec, forged, stripped upper receiver. It's all you need.

Well, okay, you'll probably also want an M16 BCG (like this excellent nitride, C158 bolt carrier) and a quality, free-float handguard (like our custom, lightweight M-LOK units). And yeah, you'll probably want a lower parts kit and a lower receiver, such as our O.G. 80% lowers. The point is, you want to build an AR truly piece by piece. And we're happy to afford you a perfect M4 flattop clone stripped upper like the unit you see here. It provides that classic Colt profile with a Picatinny rail on top, minus the $400 pricetag for that ole' pony roll mark.

A Truly "Stripped" Upper

A lot of uppers advertised as stripped units still come with the dust cover and forward assist installed. While some enjoy the convenience, others don't like the fact that it takes away from your custom build. If you want to install a custom dust cover and FA, this is the properly stripped upper receiver you want. Plus, it's more affordable than those other units.

Type III Hardcoat Anodized

This stripped upper ships with a perfect, mil-spec, Type III Hardcoat finish. Whether you grab one of our in-house 80% lowers and handguards or grab some other custom parts to complete your AR, you can be happy knowing the finish on this receiver will match just about any other retail AR parts that also come with a mil-spec anodized finish.

Ready to assemble?

This upper receiver ships with conventional 1.25x18 TPI barrel nut threads which are properly cut for the indexing pin on your barrel's extension. This makes your barrel and handguard install guesswork-free. All you'll need are the appropriate gunsmithing tools to complete your upper assembly's installation:

Tools required:

Here's our instructional guide on how to assemble your stripped upper with a barrel, handguard, and gas system.


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.