90 mm Gun M1/M2/M3
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The 90 mm gun M1/M2/M3 was an American heavy anti-aircraft and anti-tank gun, playing a role similar to the German 8.8cm Flak 18. It had a 3.5 in diameter bore, and a 50 caliber barrel, giving it a length of 15 ft. Wikipedia
Caliber: 90 mm (3.5 in)
Crew: M1: 8 (1× gunner 7× loader); M2: 8 (1× gunner 7× loader)
Elevation: M1: -10° to +90°; M2: -10° to +90°; M3: -10° to +23°
In service: 1938–1960
Length: M1A1: 29.6 ft (9.0 m)
Mass: M1A1: 19,000 lb (8,600 kg); M2: 32,300 lb (14,700 kg); M3: 2,260 lb (1,030 kg) (gun only)
Maximum firing range: Maximum horizontal: M1A1: 62,474 ft (19,042 m); Maximum ceiling: M1A1: 43,500 ft (13,300 m)