They will soon be forced to undergo more thorough screening as it should have been. They gotta crack down on the GUN SHOW sales that are sneaking in all the time and make "certain firearms" legal only for the range. That's actually more powerful of a rule than you think.
Of course those things will have zero effect on anything, criminals don't give a shit about them, they only harm the law abiding. What percent of criminals who are in prison for gun crimes obtained their guns at gun shows do you imagine?