Beaumont–Adams revolver
…adopted by the British Army in .442 calibre (54-bore, 11.2 mm) in 1856, it was replaced in British service in 1881 by the .476 calibre (11.6 mm) Enfield Mk I revolver. On 20 February 1855, Lieutenant Frederick E. B. Beaumont of the Royal Engineers was granted a British patent for improvements to the Adams revolver…