That may turn out to be interesting.

The business model of this machine (well, aside from the advocacy/self-promotion angle others describe) is that one person buys this, then allows others to use it to finish their "80% receivers". (And then they do a hell of a lot more work to turn it into a safe, functioning gun, but that's assembly, not machining, a lot more people are good (enough) at the former than the latter.)