I just posted a YouTube video showing the use of a Shapeoko to finish an 80% lower receiver using prototype tooling from CM-Tactical. I will post back in this thread with pricing and availability details once I have them for anyone interested.
This is a demonstration video only. I will try to post an instructional video as I can put one together, but I strongly suggest you familiarize yourself with the Shapeoko videos by Winston Moy for working with aluminum. The Shapeoko cuts aluminum well, but there are many things to keep track of with aluminum that aren’t as critical when cutting wood. Winston provides good tutorials for cutting aluminum. I recommend trying something simpler than an80% receiver for your first aluminum project.