1.1-inch/75-caliber gun
Appearance
The 1.1"/75 (28mm) gun is an almost forgotten anti-aircraft weapon of World War II.
It was developed when the US Navy Bureau of Ordnance (BuOrd) decided that the .50 caliber machine gun was not adequate for future AA duties.
Due to teething problems that were never rectified, the gun was very unpopular with its crews. It was replaced with the Bofors 40 mm gun whenever possible.