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A metal used for guns specifically : a bronze formerly much used as a material for cannon. 2 : an alloy or metal treated to imitate nearly black tarnished copper-alloy gunmetal. 3 a bluish-gray color.Gunmetal, also called G Metal, variety of bronze, formerly used for ordnance . Modern admiralty gunmetal is composed of 88 percent copper, 10 percent tin, and 2 percent zinc and is used for gears and bearings that are to be subjected to heavy loads and low speeds.Gun metal, also known as red brass in the United States, is a type of bronze; an alloy of copper, tin and zinc. Proportions vary but 88% copper, 8–10% tin, and 2–4% zinc is an approximation. Originally used chiefly for making guns, it has largely been replaced by steel for that purpose.