"The Webley Mk. IV is a 6-shot, double-action top-break revolver chambered in .455 Webley, with a 286?mm (11.25?in) overall length and a 4?in barrel. Adopted by the British Army in 1899 as the ""Boer War Model."" Improved over Mk.?III with stronger steel, case-hardened parts, and better extraction. Served UK and Commonwealth forces for over 70?years; found in 25 countries today. The Webley Mk. IV .455 is a compact, robust top-break revolver with a 4?in barrel, 6-shot cylinder, and the distinctive .455 Webley cartridge, designed for service use and notable for its durability and rapid reloading."