Hundreds of gun rights supporters rallied on the steps of the Vermont State House to oppose any attempt at gun control. Saturday’s rally was organized by the group Vermonters for the Second Amendment, which says an individual’s right to keep and bear arms is being threatened. Organizers said more than 500 people attended the rally. Police estimated the attendance at 400. The rally included speeches from activists and legislators from both political parties. Some participants carried signs underscoring their message, such as ‘‘Don’t Assault Our Weapons.’’ The rally also drew a few counter-demonstrators across the street who want more gun controls.