That every link to "Where did the gun come from?" is going to require this.
No. of legal gun owners in decline; no. of shooting victims on the rise
I don't know what bothers me the most.
Or
"Legal gun owners" doesn't mean registered gun owners. I own quite a few firearms who's serial numbers have absolutely no connection to me whatsoever as they were purchased from private owners or given as a gift. That doesn't make them "illegal", it simply means I own a piece of property that the government, thankfully, has no knowledge about.
Ask not "Where did the weapon come from?", rather "What fuck-nozzle judge let the scumbag criminal out on the streets in the first place?"
You'll find the answers to crime reduction much faster.