gunmetal
Casting bronze, of from 10 to 15% tin, about 2% zinc, and the balance copper; formerly used for making cannon barrels, and later also for a variety of machine components and other devices.
Casting bronze, of from 10 to 15% tin, about 2% zinc, and the balance copper; formerly used for making cannon barrels, and later also for a variety of machine components and other devices.