I've just read about a case filed in CA against the San Diego sheriff for arbitrary license denials. It seems to me like if this challenge were to eventually succeed on constitutional grounds (which obviously may or may not happen) this would essentially recognize the right to bear arms, and be a great avenue to challenge the practice of issuing restrictions on LTCs in MA.
http://www.nraila.org/Legislation/Read.aspx?id=5809
http://www.nraila.org/Legislation/Read.aspx?id=5809