Some of you guys have a lot of experiece in selling firearms FTF. When you do sell one that way, what documents, if any, do you require from the buyer ? Do you ask to see their driver's license to be sure they reside in the same state ? Do you ask to see their ccw if they have one ? Do you record the numbers ? Do you have them sign a bill of sale ? Or do you just size them up and do the deal ? Obviously I have never done this but am considering it. I would appreciate your comments from experience. Thanks.