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The 1.1"/75 caliber gun was an American anti-aircraft weapon of World War II, used by the United States Navy. The name means that it had a diameter of 1.1 in (28 mm) and barrel caliber of 75 (1.1 inches × 75 = 82.5 in (2.1 m)). The gun was designed to replace the M2 Browning and four barrels were required to duplicate the rate of fire. The first shipboard installation in 1939, was quickly nicknamed the Chicago Piano, possibly because it was the size of a baby grand piano and looked a little like a baby grand without its lid (although the reminiscences of the sailors who served with these guns all agree on the nickname, no one seems to know where it originated).

By 1941, these guns had been mounted on destroyers, cruisers, battleships, aircraft carriers, and some auxiliary ships. Nearly a thousand guns had been produced before production shifted to more reliable shipboard anti-aircraft machine guns in 1942. Quantities were minimal; one mount for a destroyer, two mounts for pre-1930s, and four mounts for North Carolina and newer battleships. On at least some ships they were director-controlled.

Medal of Honor: Pacific Assault[]

1.1 inch/75 Mk.1 appears on USS West Virginia. The player uses this anti-aircraft gun to repel aircraft attacks during the attack on Pearl Harbor. The gun has a high rate of fire, but low accuracy. Usually the plane can be shot down with 1-2 hits.

Trivia[]

  • Gunner on anti-aircraft guns indicates which side is approaching aircraft.
  • In reality, this anti-aircraft gun was never put on the USS West Virginia.
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