FYI - laws (or rules) have changed recently. Before September of this year Non residents needed to attend a state approved firearms class, submit fingerprints, photo (passport size), fill out questionere and a check for $100. This for the privilege of carying for 12 months....
Now for the changes:
All of the above except a phot and fingerprints, they do this in Chelsea MA.
So one needs to send the application and $100. I did this in early September...
For more information of NFA Gun Trusts or to learn if your state permits ownership of Silencers, SBR's, or Machine guns without your CLEO's signature visit the Gun Trust Lawyer website.