What should a person do if he or she comes into possession of an unregistered NFA firearm?
Contact the nearest ATF office immediately. A listing of the telephone numbers can be found online at www.atf.gov/contact/atf-field-divisions.
Source ATF: https://www.atf.gov/firearms/qa/what-should-person-do-if-he-or-she-comes-possession-unregistered-nfa-firearm
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