I understand the paranoia of possibly selling to a prohibited possessor but, look at it the way law enforcement has to look at it. Private gun sales don't legally have to go through background checks in Arizona so, if a gun shows up in a crime that you once owned, it gets real tough to prove that you intentionally sold it to a criminal. Even more difficult to connect you with the crime itself without other additional evidence. Yes, the cops will come ask you some questions but, if you don't have a criminal record and you explain how the sale of the gun went down, there is little in the way of evidence that you did anything wrong. It does not automatically involve an arrest.