Oops. He was probably convicted under c. 269 § 10(m) -- possession of LCFD.
In the limited research I've been doing, that seems to be the
charge most of the time I've been able to find "gun posession"
cases online somewhere.
I would be interested to see, however, any case law/writeups
on prosecutions based on the MA AWB. I haven't been able to find
any yet, but I don't have access to a lot of the legal search engines
lawyers, judges, etc, have access to. I thought most of
that stuff was public but it seems there is a lot of services out
there that make you pay for some sort of subscription, etc.
The news reports one sees are kinda worthless because they are
often ambiguous about what the guy was charged with, etc...
-Mike