These extra machining plates will transform your AR-10 Elite Builder Jig into the an Elite Builder Patriot 80% Lower Jig. The Patriot setup works with our AR-10 / LR-308 80% lower receivers, too. If you want to invest in a new 5.56 or 223 build kit and you want to machine the optional receiver in the kit with your EB Jig, this is the add-on to grab!
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