Beaumont–Adams revolver
The Beaumont–Adams revolver is a black powder, double-action, percussion revolver. Originally adopted by the British Army in .442 calibre in 1856, it was replaced in British service in 1880 by the .476 calibre Enfield Mk I revolver. Wikipedia
Action: Double-action
Calibre: .479 in (12.2 mm) (38-bore),.442 (54-bore) &.338 (120-bore)
Designer: Lt. Beaumont (Royal Engineers), Robert Adams
Effective firing range: 35 yd (32 m)
Feed system: 5-round cylinder
In service: 1862–1880
Length: 11.25 in. (286 mm)