As mentioned, it's a backdoor or proxy to attacking the private sale. I think as an attack vector against the "RKBA" it makes an entity to the feds called the "gun show", which I don't think currently exists in law at least at the federal level. Gun shows represent an aggregate of, if you're against gun ownership, the wrong sort of people gathering in large numbers to do the wrong thing. It could open the door further to messing with gun shows as a full entity, or to harangue the non-gun dealers present at gun shows on future gun bills.
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