Léon Nagant was a Belgian firearms designer best known for his work on revolvers in the late 19th century. He is particularly recognized for the Nagant M1895, a unique revolver that featured a gas-seal system, enhancing its muzzle velocity and accuracy. This design was adopted by the Russian military and saw extensive use during World War I and the Russian Civil War. Nagant's contributions to firearm design extended beyond the M1895, influencing various other models and designs. His innovations in revolver mechanics and engineering have left a lasting impact on the development of handguns, making him a notable figure in the history of firearms.