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10 of 10 Items
10 of 10 Items

Our .308 80% jigs provide you the tools you need to complete that AR-10 clone or 700-yard bench rifle receiver. Choose the rugged Elite Builder Jig, fabricated from hardened steel with drill bushings, and confidently cut and drill your receiver for your lower parts kit, upper, and buffer system in a single afternoon. Or stick with an ultra-light but capable polymer .308 lower-and-jig combo from Polymer80 and get everything you need in a single order for a great price!

Jig & Receiver Compatibility

Each of our stand-alone .308 jigs is designed to be compatible with the popular DPMS LR-308 (gen 1)-type .308 80% lower receiver. These full-size receivers closely mimic the size and shape of the original ArmaLite-10 platform, offering you the opportunity to build an accurate 7.62 NATO or .308 shooter from the ground up. 

NOTE: Due to minor variances in physical shape, the LR-308 platform is not compatible with original AR-10 components. An AR-10 upper receiver will not interface with the LR-308 lower, and vice versa. View our comparison guide detailing these two platforms for more information.

AR-308 Jig: What's Included

The Polymer80 .308 jig includes all parts required for machining, including the polymer receiver blank itself! Purchasing a stand-alone jig like the Elite Builder also provides you with all components required to cut and drill your receiver blank (minus the receiver and hand tools required to operate the jig):

  • (2) Side plates
  • (3) Top plate templates
  • (1) Set of HSS drill bits
  • (1) HSS end mill bit (center-cut)

Tools Required:

  • *Drill press
  • Table-top vise
  • Cutting fluid

*While other jigs on the market require a router or milling machine, the Elite Builder's HSS end mill bit is designed to allow you to cut the fire control cavity with plunge cuts, vertical cuts made with the end mill in similar fashion as drilling the cavity's pilot holes. This is easily accomplished using a cross-slide vise that affords lateral movement. With a cross-slide and press, you can complete your receiver blank in under two hours.

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.

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.