In Massachusetts, if you are arrested for unlawful sale of a firearm and ammunition, does the grand jury have to indite you?

In Massachusetts, the District Court has jurisdiction over these charges and therefore, the case need not proceed to Superior Court by way of indictment. The District Attorney's Office may seek an indictment, however, it is unlikely unless there are significant additional facts to support indictment. There may be a number of factors that directly effect your statute of limitations. Given there may be a risk of incarceration, it would be wise to seek advise from an experienced criminal attorney.