I have two - one I bought way back from a friend (thus no background check, but still legal) and one I bought in a shop (with a friend who is a police officer). In CA you had the 3 day waiting period then. However, I doubt that to be a problem.
It wouldn't make sense to have a "Hit" in the database based on something completely legal. If that were the case, forget about EVER getting through the name check process.
As I wrote on a different thread, I often have to pass background checks and have nothing on file (in CA you can request a copy when that is done).
That's just my best guess opinion, wouldn't make much sense otherwise, but then what makes sense lately.