The Ball Gun was the nickname lauded to a deployable heavy weapon employed by the Galactic Republic. It was a floating box-like artillery platform that would to a destination and deploy.
When a designated area would be reached for the ball gun to be fired from, the 'box' would open and plant itself firmly to the ground, rendering it immobile while in firing mode. When deployed fully, the firing module stuck out to reveal a large, ball-like muzzle from which the high-powered shots were slung from. The "ball gun" earned its nickname due to this globe-like beam emitter.