Massachusetts lawmakers have reached a deal on a significant gun reform bill that aims to address gun violence and illegal ghost guns. The compromise legislation mandates serialization of all gun frames and receivers and imposes penalties for untraceable firearms. It also expands 'red flag' laws, prohibits firearms in schools, polling places, and government buildings, and invests in community-based violence prevention programs. The legislation follows heightened calls for gun control after recent high-profile incidents, including an attempted assassination of former President Trump. The bill is expected to be signed by Governor Maura Healey soon.