If you buy a gun at a gun show, make sure you use a credit card.
Long story. A shooting buddy of ours finally gave in to peer pressure and bought a .45 at a gun show here in Vegas. It was a small Taurus (not a 1911 model). At the range, the striker didn't hit the primer hard enough to fire our reloads (we had put literally 10s of thousands of these rounds through our 1911s, with very few failures). When we tried factory ammunition, the Taurus would fire, but wouldn't cycle.
The seller owned a gun store in Utah, but since he sold the gun at a gun show, he refused to warrant it. Turned out the gun had previously been returned to Taurus, and had been "repaired" then shipped back still defective.
My buddy called his credit card company to reverse the charges (they had processed the payment through their store), citing defective product, then shipped the gun back to the gun store in Utah. They accepted delivery, then shipped it back to his home address. He refused delivery. They made a lot of threats, and he told them basically to shove it.
The moral: If he hadn't used a decent credit card to make the purchase, he would have been stuck with the gun. Small claims court would have been a difficult option.