Japan which has a very strict sword and firearms law, afaik, has not seen a "homebrew" industry spruot since they passed the laws back in the '70s. And, it's not as though there are no criminals. The Yak syndicates are not, on principle, against the use of guns --they do occasionally used smuggled guns to settle things.
Now, Japan does allow some kinds of firearms, typically to farmers and such who need to deal with threats/vermin, but the permit process is lengthy and few people obtain them.
Japan has a completely different culture from the US (obviously). You can't ignore the effects of such different attitudes towards individualism, income disparity, acceptable levels of violence, and trust in government. Never mind that the US is a multicultural society, whereas Japan isn't really.
True.. but as it regarded homebrew, there is "pent up demand" demostrated by the trickled smuggling by the gokudo syndicates. Yet, there isn't a homebrew industry. Instead, the few illegal arms are smuggled in. My point was that homebrew does not seem to spring up once firearms are made illegal, to any significant extent. Americans own approx 300 firearms. I don't think homebrew would manufacture in that quantity.
Firearms last decades, most of those 300 million firearms are unregistered (indeed the number could be far higher), so there isn't really a feasible way to get rid of even half of them.
Guns last decades to centuries, the underground manufacturers only have to make enough to keep up with criminal population growth to keep the criminals just as supplied with guns as they are today.
It might actually be worse because many of the law abiding citizens who previously left their guns sitting in the basement will be willing to sell on the black market with gun prices rising.
Japan which has a very strict sword and firearms law, afaik, has not seen a "homebrew" industry spruot since they passed the laws back in the '70s. And, it's not as though there are no criminals. The Yak syndicates are not, on principle, against the use of guns --they do occasionally used smuggled guns to settle things.
Now, Japan does allow some kinds of firearms, typically to farmers and such who need to deal with threats/vermin, but the permit process is lengthy and few people obtain them.