Other than completing AR-15 lowers, the Ghost Gunner might help make lots of other guns and with some 3rd party help you are able to open up up the Ghost Gunner to complete other tasks like engraving your lowers. It's also possible to mill other lowers like a Polymer 80, https://ghostgunner3forsale78899.gynoblog.com/32107775/the-smart-trick-of-ghost-gunner-3-that-no-one-is-discussing