The same ultra crude model of submachine gun has been widely seized by
police in Brazil over the last couple of years suggesting that a large number were being produced. These guns usually feature a trigger unit
cut out from plastic and a barrel and bolt made from brass bar.
Automatic firearms as crude as these do well in illustrating the pipe
dream of prohibition.
"Nonsense! All we have to do is register the sales of all brass and plastic, and drill presses, and mills, and lathes, and anything else, and decree warrantless inspections(that 4th Amendment is such a pain), and hire enough inspectors to cover the country, and that will take care of it nicely!"
I probably shouldn't even float that as a joke, some of these idiots will think it's a fine idea.