The 25mm GAU-22/A is an externally powered Gatling gun installed in the F-35 Lightning II fighter. This four-barrel gun is a derivative of the 25mm GAU-12/U gun. It is over 40 pounds lighter and occupies 20 percent less volume than the comparably equipped 5-barrel counterpart. The gun is easily configured to mount in either the F-35A internal gun system installation or the F-35B/C missionized gun pods.