1.1"/75 caliber gun

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1.1" / 75 Caliber Gun
Quadruple-mount 1.1-inch (28 mm) anti-aircraft cannon aboard the battleship USS Pennsylvania (BB 38) during World War II
Type Anti-aircraft Naval Gun
Place of origin  United States
Service history
Used by US Navy
Wars World War II
Weight 10,500 pounds (4,800 kg)
Length 119.6 inches (3.04 m)
Barrel length 82.5 inches (2.10 m) bore (75 calibres)

Shell HE-Tracer
Caliber 1.1-inch (28 mm)
Recoil 3.25-inch (83 mm)
Elevation -15 to 110 degrees
Traverse 360 degrees
Rate of fire 150 rpm
Muzzle velocity 2,700 feet per second (820 m/s)
Maximum range 6,300 yards (5,800 m)

The 1.1"/75 caliber gun was an American anti-aircraft weapon of World War II. The name means that it had a bore diameter of 1.1 inches (28 mm) and barrel length of 75 × 1.1 inches = 82.5 inches (2.1 m), using the "caliber" nomenclature common to large artillery pieces.

It was developed when the U.S. Navy Bureau of Ordnance (BuOrd) decided that the .50 caliber machine gun was not adequate for future AA duties.

During the early part of the World War II, they were deployed on most U.S. Navy warships of destroyer and larger size.

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, but served until the end of the war on some ships.

The guns were sometimes referred to as "Chicago Pianos."

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