I've toyed with the idea many times, mainly because I like making things I can use, and not because of the whole "secret gun" thing. I wven went so far as to purchase a nice cross slide vise and a few other tools for the purpose. But in the end I just can't justify the price for the 80% lower, jigs, mills, etc. when I can buy a completed Anderson lower for $45 otd just down the road from me. Maybe someday.