An 80 percent lower is the easiest and most affordable way to become the proud new owner of an AR-15 rifle or pistol that's totally custom. Available in standard 5.56 NATO or .223 Win, .308 Win, and 9mm, these 80% lowers afford you the same quality stripped receiver that you’d find at the local gun store. All that's required of you, the builder, is some basic cutting and drilling with a tool called an 80% jig, and some simple hand tools.
Counter to federal law, some states have enacted restrictions or bans on partial firearm kits, individual gun parts, and 80% lowers. We cannot fulfill any orders placed by residents in those states. Please check out Shipping & Returns page to confirm whether your state is restricted before attempting to place an order.
Every 80 percent lower is built to standard, "mil-spec" specifications so they’re compatible with any AR-15 lower parts kit trigger assembly, buffer kit, and upper assembly you’d otherwise buy for an off-the-shelf AR-15 receiver.
To fabricate your receiver and make it ready for assembly, you'll need to perform four steps:
These four steps take less than two hours for most builders with no experience. Experienced "smiths" can complete a receiver blank in around 30 minutes to 1 hour. You'll need a drill press (which can also be used to cut the main cavity with center-cut end mill bits and plunge cutting), a bench top vise, and some machining oil. All 80% jigs include the required drill bits, including a center-cut end mill.
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 80lowerjig.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.