2) In theory guns must be specifically willed to you to be allowed to be moved state to state after a death without a FFL involved.
I keep reading this from non-authoritative sources. What I’ve read from what seem like authoritative sources all say “inherit”, without saying “specifically willed” (or similar language).
To me that means the executor can, if not otherwise specified, declare that anyone they choose gets the guns as part of the estate.
If this is not true, I’d like to see a reference in law or regulation.
5) if you want to play looser with the law, just file a EFA-10 on them within 7 days of you getting them into MA with no FFL
This does not seem to violate any laws.