An 80% lower jig is the only way for an AR-15 builder to complete their 80 percent lower receiver with accurately drilled pin holes, and a properly milled fire control cavity for the trigger, hammer, and other components. Since, by design, an 80% lower still requires the builder to complete the last 20% of the milling process to make the receiver functional, an 80% jig removes the need for making complex calculations or programming a CNC machine.
Instead, the 80 percent lower jig provides pre-designed cutting and milling templates to be used in tandem with a drill press or mini-mill. Each jig also comes with "template" plates that provide guides holes for drilling the pin holes for the lower parts kit:
Most AR 80% receiver jigs (like the Elite Builder's jig plates shown above) are made from high-strength steel or aerospace-grade aluminum alloy, so they can be reused to complete several 80 percent lowers. Our store carries both AR15 Jigs and AR-10 Jigs for 5.56 NATO and .308 Winchester builds. They are designed with safeguards in place so that you do not drill too deep or mill out more than necessary. Also included are the required drill bits for the pin holes, and end mill bits for cutting inside the receiver.
Not sure which jig is right for you? Here's the guide on all 80% jigs.
Ready to fabricate? Here's how to mill a lower with a drill press.
While the actual milling process takes some attention-to-detail, it is a fairly straightforward process and all our 80 lower jigs come complete with easy step-by-step instructions. Also, the individual components of each jig are clearly labeled for tooling and measurements and coordinate with the instructions to ensure your AR-15's finished receiver is a strong and sound success!
What other tools do I need to complete my 80% lower?
Besides the jig, all you need is a basic drill press or mini-mill, a tabletop vise, and some machining oil. The 80 percent lower jigs for all weapon platforms come with the required drill bits and end mill bits. Polymer-receiver jigs and certain pistol jigs may instead require hand files, a handheld drill, snips, or a Dremel to complete the corresponding 80% frame.
This guide covers all tools (required and recommended) in detail.
Do I need a special license for this?
No. An 80 lower jig isn't considered firearm and no license is required to buy or own one. The same goes for 80% lower receivers under federal law. Some states have banned or restricted 80% lowers, so check our Shipping & Returns Policy to see which states we cannot ship to, and check your local and state laws before attempting to buy components or build a firearm at home.
Execute the right to bear arms today. Your build awaits you.
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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.