== == If you are trying to find the number for a gun you no longer have you will have to go back to the dealer who sold it to you, if the dealer is still in business. Dealer records are the only place serial numbers are recorded.
If the dealer is out of business, his records may have been sent to the BATF. Theoretically they store them, but I have never heard of anyone having much luck getting any information out of there. If you got it from a private individual, you could hope he recorded the number and you can locate him.
Absent these sources you are out of luck.
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