The light AA armament of the "Fusō" class changed dramatically from 1933 to 1944. During the first reconstruction, "Fusō" was fitted with four quadruple machine-guns, while "Yamashiro" was fitted with eight twin gun mounts. Both weapons were license-built French Hotchkiss designs. The 25 mm guns were mounted on the "Fusō" class in single, double and triple mounts. This model was the standard Japanese light anti-aircraft gun during World War II, but it suffered from severe design shortcomings that rendered it a largely ineffective weapon. The twin and triple mounts "lacked sufficient speed in train or elevation; the gun sights were unable to handle fast targets; the gun exhibited excessive vibration; the magazine was too small, and, finally, the gun produced excessive muzzle blast". The configuration of the anti-aircraft guns varied significantly; by the end of their final reconstruction, the "Fusō" class mounted eight twin mounts. In 1943, seventeen single and two twin-mounts were added for a total of 37. In August 1944, both were fitted with another twenty-three single, six twin and eight triple-mounts, for a total of 95 anti-aircraft guns in their final configuration.