Tooling to mill an incomplete lower: $400-1000. Milling a lower from scratch? Hundreds of thousands in tools, bits, taps, knowledge, prototyping, time. It's a hobby project. Give it a break, you guys are more bent on stirring up s**t than most antis I know. I have an RPAL, as well as firearms registered to it. If I wanted to be sneaky, I'd save myself the time and money and buy it on the street like the rest of the criminals do.