Do you believe you can just walk up to any booth and buy a gun without a NCIS federal background check? Do you think it's legal for the dealer to sell to you without running one?
dealer to person sale = background check
person to person sale = no background check
In most states, a private person may sale a firearm to another person and without a background check.
Been to a gun show lately? There are usually lots of people walking around the show with a "for sale" sign on their firearm, no background check needed.
Even if the government stopped private person-to-person sales at gun shows, have you read the paper lately? I can pick up a local newspaper and see at least a dozen people trying to sale their firearms.
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If background checks are enforced for all firearm sales, will we need checks to give firearms as gifts? Would I be able to give my brother a new Remington 870 for Christmas, without first running a background check on him?
If criminals can get illegal drugs across the border, the government can not stop illegal weapons.