U.S. Supreme Court, Caetano v. Massachusetts, “The Court has held that “the Second Amendment extends, prima facie, to all instruments that constitute bearable arms..."

   An amazingly brief opinion. The file is in PDF format for easy download:

U.S. Supreme Court, Caetano v. Massachusetts, “The Court has held that “the Second Amendment extends, prima facie, to all instruments that constitute bearable arms, even those that were not in existence at the time of the founding,”” March 21, 2016