By the end of World War 2, was the 1.1 inch anti-aircraft gun phased out completely from the US Navy service? - Quora
![The American version of the "Nine-Six Artillery"—the American 28mm "Chicago Piano" anti-aircraft gun - iNEWS The American version of the "Nine-Six Artillery"—the American 28mm "Chicago Piano" anti-aircraft gun - iNEWS](https://p1-tt.byteimg.com/origin/tos-cn-i-qvj2lq49k0/3b29a987209144e98627c0ed55e74c59.jpg)
The American version of the "Nine-Six Artillery"—the American 28mm "Chicago Piano" anti-aircraft gun - iNEWS
![The "Chicago Piano" was a US WW2 28mm anti-aircraft cannon. It was placed in quad mounts on various warships but was very unreliable. It first saw action during the attack on Pearl The "Chicago Piano" was a US WW2 28mm anti-aircraft cannon. It was placed in quad mounts on various warships but was very unreliable. It first saw action during the attack on Pearl](https://external-preview.redd.it/e5Jntzqy5JB_bCBXtRUt5SyBHa4a8CpRly_cL7s-mHk.jpg?auto=webp&s=3c07ba907b9a7643e20ac875bbdc50a9437b9eed)
The "Chicago Piano" was a US WW2 28mm anti-aircraft cannon. It was placed in quad mounts on various warships but was very unreliable. It first saw action during the attack on Pearl
![The American version of the "Nine-Six Artillery"—the American 28mm "Chicago Piano" anti-aircraft gun - iNEWS The American version of the "Nine-Six Artillery"—the American 28mm "Chicago Piano" anti-aircraft gun - iNEWS](https://p1-tt.byteimg.com/origin/tos-cn-i-qvj2lq49k0/70f350d1c13242a4842fb9170dc23790.jpg)