Gov. Maura Healey signed an emergency preamble early this month that effectively put a new gun law into immediate effect, expanding Massachusetts’ preexisting firearms regulations—already some of the strictest in the country. The move will crack down on private-made “ghost guns”; criminalize possession of “bump stocks” and trigger cranks; require a gun license for live-fire training; prohibit people outside of law enforcement from carrying guns at schools, polling places, and government buildings; ban the possession, transfer, and sale of assault […]