If they get an honest court, they have a good argument. I was following bith CT and NY as they pulled out all the stops on their midnight politics games to get these draconian new laws passed. Connecticut did it by eliminating any committee assignments or public hearings on the new bill on the basis that it was "emergency" legislation. This was in late March or very early April, IIRC. Sandy Hook was mid-December, so the law was being drafted and voted on 3-1/2 months after the isolated incident, and there had been no indications, suggestions, or threats of anyone trying to commit a copycat attack. So ... what, exactly, was the "emergency"? A law that so drastically affects fundamental human/civil rights ("fundamental" according to the U.S. Supreme Court in Heller and McDonald) should be subjected to the most vigorous scrutiny and debate, not enacted in the dark of night (literally!) without even giving the lawmakers time to read it, let alone discuss it.
The problem is that I doubt there's an objective judge anywhere in the CT court system. They are ALL card-carrying liberals.