>>>Not exactly true. Any licensed gun dealer at a gun show has to do background checks. Only private citizens can sell guns without a check. Of course, private citizens can sell/buy guns anywhere without background checks.
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>>Can some a private citizen buy lots of guns from licensed gun dealers before the show, pass the background check and get the guns and then sell them in the gun show for a hefty profit? Is there any limit on the amount of guns you can buy or sell (if you are not licensed)?
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>Sure they can. And all the gun's serial numbers will be registered to the citizen that can be traced back to them if they sell them to criminals.

So, if I sell a gun to a criminal and the criminal do their thing with said gun, am I liable? that doesn't sound bad.