It asks on the form when you buy one if you're a legal resident or not and if you lie its probably a felony. If the gun seller was suspicious they would call the police/ATF and then tell you there was a delay with the background checkl and have you wait there until the police came. Then you would probably get gang-raped the first night in county jail.
maybe this is the idea?
go to states
try to buy gun and lie
police arrest and imprison
call me daddy