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Precision 80% 308 jigs for completing your AR-10/ LR-308 build.

Starting the assembly process of your .308 80% lower or LR-308 build kit is easy with the right jig. To ensure proper compatibility with the DPMS .308 platform's lower receiver, we located a range of gunsmithing jigs to suit your budget. Whether it's an affordable, ultralight polymer jig-and-lower combo from Polymer 80, or the precise and rugged Elite Builder Jig, every kit comes with the drill bits and required end mill bits for drilling and cutting your receiver blank for final assembly.

80% Jig and .308 Lower Compatibility

It's important to note the modern .308 AR is not typically found in the original ArmaLite AR-10 (or KAC SR-25) configuration. Minor variances in physical receiver dimensions and internal components render the two platforms incompatible for assembly or parts mixing. With that said, the DPMS Panther LR-308 platform is the "new AR-10", offering the same accuracy, function, looks, and reliability as the original ArmaLite rifles for a fraction of the price.

That's why we chose to support .308 builds with the LR-308 platform, offering a range of mil-spec, MOA-accurate build kits, upper receivers, and corresponding 80% lowers. Every 80% .308 jig available here is guaranteed to work with any polymer, forged, or billet DPMS-type 80% lower in the .308 caliber! 

First time building a .308? Read our guide: The AR-10 vs. The AR-308 (Parts Compatibility).

What's Included

Regardless of your jig preference, each kit comes with all the components required to successfully cut and drill your receiver blank for assembly with the lower parts kit, upper receiver, and buffer:

  • (2) Side Plates w/ Drilling Templates
  • (3) Top Plates for Fire Control cavity
  • (1) Set of Drill Bits and End Mill Bits
  • Written Instructions / Reference Guide

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.

Your .308 build awaits.


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.