I love the accidental admission that you only want to know where it’s coming from because it can’t be bought in America, implying you wouldn’t like to know otherwise.
Accross the continent, a huge number of guns recovered in crimes can be traced back to a gun store in America. It’s an incredibly low risk way to source firearms, especially compared to things like “robbing the military”.
But just because a domestic abuser with a room temperature IQ can’t buy one at his local Walmart doesn’t mean they’re not American guns. The “profits first, people never” mentality of arms manufacturers and their pet politicians has resulted in billions of dollars of weapons in the hands of militant groups.
Of course if you genuinely wanted to know, there’s multiple reports on exactly that topic. Be sure to tell us what you learn from them, so we know you’re not just defending Americas gun laws by muddying the waters.