These extra machining plates will convert your AR-10 Elite Builder Jig into the an Elite Builder Patriot 80% Lower Jig. The Patriot setup works with AR-10 / LR-308 80% lower receivers, too. If you want to invest in a new .223 of 5.56mm AR build kit and you want to use your EB Jig to machine the optional 80% lower receiver upon which the kit is based, these are the parts you need to make it work.
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