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The famous Polymer 80 jig is back.

Polymer80 helped make finishing your 80% lower easier than ever, thanks to its universal 80% jig made for AR-15 receiver blanks. This polymer jig includes the needed bits and end mills to finish any mil-spec receiver. P80's jigs were originally made to work with their propriety polymer lowers, but their AR-15 jig also provides guidance for completing aluminum (billet or forged) lowers.

Why a Polymer Jig and Lower?

Fabricating polymer is easier than machining aluminum. The material is easier to cut and drill, and the raw receiver blanks are typically more affordable than their billet or forged counterparts. Although P80 jigs are considered disposable, they can be reused to complete multiple blanks if care is taken to preserve the drilling and milling guides.

Polymer80 AR-15 Jig: What's Included

  • (1) 2-sided jig
  • (3) trigger guides
  • 9mm HSS end mill
  • 5/16ths drill bit
  • 3/8ths drill bit
  • 5/32nd drill bit

To complete your polymer AR-type lower with the RJ556U Jig, we recommend using a drill press with an appropriate work-holding vise. Calipers should be used to confirm milling depths, and basic round and flat files should be used to clean up rough edges after initial fabrication.

State Laws May Vary

Contrary to federal law, some states have either restricted or banned the sale, transfer, and ownership of 80% lowers, firearm blanks, and other gun parts. Because of these restrictions, we cannot ship our products to certain states. Please confirm whether your state is restricted on our Shipping & Return Policy before placing an order. We cannot fulfill orders to restricted states if placed.


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, 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.

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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.