During WW2 the resistance ( the real resistance) made guns like that by hand in bicycle and plumbing shops all over Occupied Europe. I think I bought a set of these plans years ago at a gun show. If gun ownership becomes illegal the Mexican Cartels will make a killing smuggling guns, ammo, RPGs, mines, grenades, etc.. Hung for a sheep, hung for a lamb...hell steal the whole flock!
Now plans for all sorts of interesting firearms are available with a click or three in pdf printable form. They can try to confiscate all weapons but.............