Its all about no consistent standard across the states. Even so however those legally owning weapons are not of any concern to me as most are trained (usually) and also enjoy target shooting at qualified ranges etc ... not all but most.

It is the weapons in the hands of the criminals. No felon can legally own a gun .. so what do they do, go to a gun show and walk out with enough weapons to arm a small country. Take them to a city and sell them for 10x the money ... at the gun show, no background check, none. If a dealer has a federal firearms license, yes they are still required to do the check, however, private sales are not covered. What do you find at gun shows? 90% private sales cause ... no paperwork

Get rid of that loophole, we will all be safer