This is great, thankyou.
I've been designing a .22LR handgun that could be printed on a 3D printer. the resulting gun would look something like this with an actual handle. Imagine if you could print one of these guns using abs plastic around $25 a piece. They would be completely unregulated and you could always have the option to build one with a longer barrel like a sub machine gun.
3D printable .22lr handgun