Correcting Incorrect ATF Approved Forms
The ATF can correct approved ATF Forms if you have an issue with the registered firearm information and the actual firearm information from the firearm, e.g. serial number, model number, caliber, etc. The ATF National Firearms Act Handbook - Section 3.6 Correcting incorrect registration documents indicates that, "Section 3.6 Correcting incorrect registration documents. Occasionally, the registered possessor of an NFA firearm may notice that the registered firearm does not match the registration document. Perhaps the serial number is slightly different. In this situation, the registrant should take a photograph of the markings on the firearm (or a rubbing) and send it to the NFA Branch with a written request to correct the serial number as documented on the NERTR. ATF will respond to the request by letter stating that the NFRTR has been corrected and advising the registrant to keep the letter with the registration document as evidence of proper registration."
“ATF National Firearms Act Handbook.” Bureau of Alcohol, Tobacco, Firearms and Explosives, Apr. 2009. https://www.atf.gov/media/25161/download
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