Britain's New Machine Gun On Show: Demonstration the 7mm sustained fire Machine gun (showing new ammunition), counterpart of the new calibre (.280) replacing the . 303 Vickere machine gun. Demonstrations were given yesterday at Warminster of the new .280 rifle which is to supercede the .303 Lee Enfield, and of the counterpart machine gun of the same calibre which will replace the old Vickers veteran. The new rifle is that which Minister of Defence Mr. Shinwell took with him to the U.S. for the proposed general equipment of British American and Canadian forces. August 11, 1951. (Photo by Fox Photos).