As far as I understand, any gun that crosses a state line would have to go through a FFL.
This^^^legally it a ffl, in the real world it happens all the time,
No, when crossing state lines all purchase transactions must be handled via an FFL and in accordance with respective state statute, the bequest subsection is only applicable when a legal and demonstrable will is being executed (read you better be dead and gone and your will spelled out on an individual basis or "at will" by the executor to interested and responsible parties. Here is an excerpt from the federal GCA act.Can a resident of indiana, (non FFL) buy a long gun from a resident of ohio (non FFL) legally? Any case law to back it up either way?