Gun Metal (red brass, leaded red brass), s. brass; an alloy of 88 % copper, 10 % tin, and 2 % zinc or lead, used for bronze gun barrels. In military modelling, the term »gun metal« is often mistakenly used to describe the colour of wrought iron or blued steel.
Mixed Pigment Colours
Source: Meyers Großes Konversations-Lexikon, 6. Auflage 1905–1909