The state they were sold in. Not the state of residence of the purchaser. Correct?
Some quotations from the Mance v Holder decision (citations omitted):
Under the law, FFLs may transfer rifles and shotguns to nonresidents so long as the FFL and recipient meet in person and the transfer
fully complies with the legal requirements of both states.A Texas FFL must ensure that a Sacramento, California resident who purchases a rifle is legally entitled to do so under federal, Texas, California, and Sacramento law.
While a California FFL in San Diego might have to research the local hadgun restrictions in place for a Sacramento, California resident purchaser, some 500 miles to the north, nothing prevents an out-of-state FFL from Reno, Nevada, from conducting the same research to ensure that a handgun transaction with a Sacramento resident, some 100 miles away, comports with federal, Nevada, California, and Sacramento restrictions.
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There are several mentions in the decision about a Point of Contact (POC), a person designated by any state to be informed of any NICS checks on the residents of that state when purchasing any firearms in a non-resident state, including the specifics of the firearm(s), so they can determine if that firearm is legal in the resident state. Does anyone know if Hawaii has a POC?
If someone purchased a firearm (long gun or handgun) that did not comply with state law, that firearm could be stored in a legal locality, rather than imported into the state, and thus if a POC did contact the owner re the Hawaii-illegal firearm the owner might have to provide evidence that the firearm is being kept at another location. I doubt that would be a constitutionally legal procedure without a warrant or subpoena, but I wouldn't be at all surprised to see it happen, given all the other unconstitutional laws re Second Amendment civil rights in Hawaii.