| By the end of the 16th century, these Chinese-style weapons were used extensively. It is believed that the technology, and the form of the devices, may not have changed very much. The simple addition of metal rounds, that is, ammunition, where previously gunpowder was used alone, converted devices which produced only light, sound, and heat (flame, sparks, explosions) for salutes and the like into weapons.<ref name=uezato82>Uezato. p82.</ref> Such "hand cannon" ammunition has been found in excavations at a great many sites, including [[Shuri castle]], [[Nakijin gusuku]], [[Goeku gusuku]], [[Tonakijima]]<ref>A small island betwen Okinawa to the east and [[Kumejima]] to the west.</ref>, [[Katsuren gusuku]], [[Itokazu gusuku]], and [[Ufu gusuku]]<!--大城グスク-->. Ranging from the 14th to 16th century, the rounds vary greatly in size and material. Materials used included stone, earth, iron, and bronze, and the rounds found range from one to two centimeters in diameter to more than ten centimeters.<ref name=uezato82/> | | By the end of the 16th century, these Chinese-style weapons were used extensively. It is believed that the technology, and the form of the devices, may not have changed very much. The simple addition of metal rounds, that is, ammunition, where previously gunpowder was used alone, converted devices which produced only light, sound, and heat (flame, sparks, explosions) for salutes and the like into weapons.<ref name=uezato82>Uezato. p82.</ref> Such "hand cannon" ammunition has been found in excavations at a great many sites, including [[Shuri castle]], [[Nakijin gusuku]], [[Goeku gusuku]], [[Tonakijima]]<ref>A small island betwen Okinawa to the east and [[Kumejima]] to the west.</ref>, [[Katsuren gusuku]], [[Itokazu gusuku]], and [[Ufu gusuku]]<!--大城グスク-->. Ranging from the 14th to 16th century, the rounds vary greatly in size and material. Materials used included stone, earth, iron, and bronze, and the rounds found range from one to two centimeters in diameter to more than ten centimeters.<ref name=uezato82/> |