Silencerco is now selling an NFA trust that is supposedly compatible in all 50 states for 129.99. Should be a good thing. Trust is the easiest route to go for NFA.
https://www.silencerco.com/nfa-trust/?mc_cid=31f69ca841&mc_eid=44f1c2e832
https://www.silencerco.com/nfa-trust/?mc_cid=31f69ca841&mc_eid=44f1c2e832