I don’t know - some states have no problem with MGs, SBRs,
SBSs, sound suppressors, etc as long as they are held in accordance with Federal laws, and say so in their statues.
Taking an item across state lines to such a state would invite trouble unless the states were to reword their
law such that the items in question were to be unconditionally permitted with reference to Federal law.
“without reference to Federal Law”
Some states have no problem with those, and don’t even say federal compliance is required.