"furious" retained ten of her original eleven breech-loading guns, five on each side, for self-defence from enemy warships. six qf 4-inch mark v guns replaced her original anti-aircraft guns. four were mounted on the sides of the flying-off deck and two on the quarterdeck. the four guns on the flying-off deck were removed in 1926–27 for trials of the lower flight deck, but only two were replaced when the trials were concluded. four single qf 2-pounder "pom-poms" were installed in 1927. during "furious"s september 1930 – february 1932 refit, her anti-aircraft outfit was reinforced by the addition of two eight-barrel qf 2-pounder mark v pom-pom mounts where the forward 4-inch guns on the flying-off deck had been removed earlier.