I've thought about and mentioned the same thing here before. I go by the letter of the law, NO MORE, NO LESS. Volunteering to do more isn't going to make anything better for you. All risk and no gain. You did exactly what you were supposed to by your local laws, it aint your problem. Obviously if a "gangbanger" shows up, you have the option of not buying/selling. If the state & local Leos aren't concerned, why should you be. It would be near impossible to trace ALL possible owners in a state where no records are kept. Ward Cleaver buys a brand new handgun, the Beaver takes it without Dads knowledge and robs his weed dealer Eddie Haskall with it. Eddie doesn't report the crime, the Beaver returns the gun to where he found it, Ward is clueless. The Beaver turns up with a Columbian necktie a few days later. Gee whiz Dad says Wally, I have no idea what the little dope was up to. Tell a potential buyer/seller here in FL that you want to run an independent background check on him and the gun (when neither is required by law), and see how fast that deal goes bye bye, no matter how clean the buyer/seller may have been.