I'm not sure anybody is chastizing (links?) the US arms manufacturers with the outrageous gun violence in the USA (who fecking cares where they're made), rather it is the aggressive promotion of gun sales by the right wing and NRA, and all the phony second amendment bollocks and "they're gonna take our guns" whining that real 'muricans love to blather about. Just like in the 60s when blacks were brandishing rifles and speaking of "any means necessary" to achieve equal rights, the NRA and real 'muricans couldn't move fast enough to get real gun control going. If minority gangs started talking up the second amendment and how they were going to "protect themselves" from government tyranny you would once again see how incredibly phony this right wing wankery with gun rights would crumble.
Mentioning fun facts about handgun foreign manufacturing is more simpleton right wing "gootcha points" that is a smoke screen. Let's face it, the gun fetish was created as a right wing dog whistle used by conservative right wing America to get idiots to vote against their economic interests, a la abortion, LGBT rights and scary dark people, and as we're witnessing, it's a very very irresponsible policy. No one cares so much about your fecking guns, rather than the mental issues of the people getting them so easily. The wackjobs are no longer content in offing themselves, they're now taking loads of innocents with them, and that blood is on right wing hands.