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At the federal level, you need to be residents of the same state, and the seller cannot know/reasonably suspect you are a prohibited person, and you must be adults, of course.
Many people take down ID information so they can refer authorities to the next owner, should the gun be reported stolen or used in a crime at a later date. Some others want to see a CCW or some other evidence that the buyer isn't a prohibited person. That said, those are just techniques to prove a chain of custody or make the seller feel more confident.
State laws may vary!
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