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Forget the overpriced AR at the big-box gun store. That rifle doesn't have the specs and parts you want, anyway. Build or upgrade your AR with a custom, ready-to-fire upper assembly instead. We spec each upper with the highest quality barrels and 100% U.S.-made parts.
Uppers are available in the most popular calibers: 5.56 NATO, .223 Wylde, 300 Blackout, 7.62x39, 6.5 Creedmoor, .308 Winchester, 9mm, and even .45 ACP! New side-charging uppers available!
Not all upper are made equal. Some are, in fact, wildly overpriced (looking at you, brand taxes). Others are just cheap and inaccurate. Our uppers are made from high-quality components, but we don't bother with flashy branding or marketing. We let our customers' own reviews speak for themselves.
Our uppers offer S-tier performance without the price. Every upper is carefully pieced together by AR enthusiasts who've been building custom rifles for nearly two decades.
We hand-pick all our components to ensure every upper provides optimal functionality for different AR builds. Whether you're putting together a 24"-barreled, long-range rifle, a 16" mil-spec 5.56 or .223 plinker, or a short-range subsonic SBR in 300 BLK or 9mm, you'll find an upper with the right gas system, handguard, barrel, twist rate, and other parts to get the job done.
Can't decide between a carbon and stainless barrel? Read this! 4150 vs. 416R Stainless: Which Barrel & When?
All upper ship fully assembled, with all components installed and ready for use.
*Some upper assemblies' receivers do not have forward assists or dust covers.
Some states have banned the sale of upper assemblies, receivers, 80% lowers, and certain firearm parts, or have otherwise restricted the sale and ownership of products we sell. So, be sure to check your local and state laws. We can’t ship our products to certain states. Please check our Shipping & Return Policy before placing an order (see restrictions).
Your build awaits you.
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.