The Webley Mk II is a British revolver that was introduced in the early 20th century, specifically in 1915. It is part of the Webley family of revolvers and was designed for military use during World War I. The Mk II is chambered for the .455 Webley cartridge, which provides significant stopping power. This revolver features a double-action mechanism, allowing for both single and double-action firing. The Webley Mk II was known for its reliability and ease of use, making it a favored sidearm among British forces. Its design influenced later models and remains a notable piece of firearm history.