Flash cannon
From Wookieepedia, the Star Wars wiki.
Flash cannons were large muzzle-loaded cannons based on the same technology as Sevari flashpistols. They were often mounted on large wind riders. Darth Bane, in his days with the Gloom Walkers, once came across three gunboats with flash cannon emplacements. Had it not been for his force abilities, he and the other Gloom Walkers probably would have been mowed down.
