In addition to finishing AR-15 lowers, the Ghost Gunner can help make a lot of other guns and with a few third party support you can open up the Ghost Gunner to conduct other jobs like engraving your lowers. You can even mill other lowers similar to a Polymer eighty, https://jarednqrqn.bloguetechno.com/the-smart-trick-of-ghost-gunner-3-that-no-one-is-discussing-68077228