Yserb, you’re talking in circles about two different things. I agree that there shouldn’t be so many guns, and that the culture which bred that reality is violent and against our values. So i would agree with, perhaps, placing caps on how many guns manufacturers can make, how many gun shops can be active in a locale, or other such measures.
But the criminals aren’t getting their guns from shops. They’re getting them illegally, and the decrease of guns in circulation will take decades, or more, to make a dent in the amount of working firearms in the country, legal and illegal
But one thing you suggested, limiting magazine sizes, calibers, etc… Does nothing to limit how many guns are in the country. All it does is hamper self defense for people who have guns for completely innocuous reasons.