In 1700s terminology, the process of regulating (training) the militia has to take place after first gathering the 'irregular' militia, whose members bring their own weapons. This was established even in colonial times. https://en.wikipedia.org/wiki/Regulator_Movement_in_North_Ca... You'll recall the Baker Street Irregulars, and Paul Revere's "You know the rest, in the books you have read, how the British Regulars fired and fled." The 2A's 'Arms' also covers non-gunpowder weapons. The right of the People to keep arms comes prior to issues related to their use.