The gun used in the shooting was made by Yamagami himself. It was roughly 40 centimeters long and 20 cm tall, and consisted of two pipes secured to a board with vinyl tape. An electrical cord connected to a battery was used to ignite the gunpower inside the weapon, with the pressure of the gas shooting pellets out. The weapon could fire six pellets at the pull of a trigger, and was designed to fire two shots in succession, like a shotgun.
