On Fri, 8 Jan 2016 23:52:53 -0500, "Mr. Luddite"
wrote:

Round and round we go. How do the "bad guys" get guns that can't be
traced? From "good" guys, initially. Unless of course they have basic
machine shop skills and can whip one up on a lathe. :-) I don't think
I'd volunteer to be first in line to fire one of those though. Even
major manufacturers have had problems:

https://www.youtube.com/watch?v=n0h9WWFzcVI



The thing is you can legally buy the parts you worry about blowing up
without any paperwork or restrictions at all. The serialized part can
just be the piece that holds the trigger in a lot of designs. An
enterprising person could figure out how to make some very capable
guns with minimal actual machining, just using off the shelf parts.
I know a guy (the same guy who showed me the PVC silencer) who was
making a small 9mm sub machine gun from parts with a minimal amount of
actual machining. I got away from there because I look horrible in
orange ;-)

I never heard how it turned out.

I am still surprised at how many people who are selling "almost ready"
AR lowers. Everything else in an AR is just a "part". I would worry
more about that than most of the stuff we are talking about here.