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37 mm Automatic Gun, M4 | |
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Type | Autocannon |
Place of origin | United States |
Service history | |
In service | 1942–1945 |
Used by | United States Soviet Union |
Wars | World War II |
Production history | |
Designer | John Browning |
Designed | 1921–1938 |
Manufacturer | Colt |
Produced | 1939 |
Variants | M9, M10 |
Specifications | |
Mass | 213 lb (97 kg) |
Length | 89.5 in (2.27 m) |
Shell | 37×145mmR |
Caliber | 37 mm (1.46 in) |
Action | recoil operation |
Recoil | 9+5⁄8 in (245 mm) |
Rate of fire | 150 rpm |
Muzzle velocity | 2,000 ft/s (610 m/s) |
Feed system | 30-round magazine |
The 37 mm Automatic Gun, M4, known as the T9 during development, was a 37 mm (1.46 in) recoil-operated autocannon designed by Browning Arms Company and entered service in 1942.[1] The M4 and its variants would primarily be manufactured by Colt's Manufacturing Company and Oldsmobile (under-contract by Colt) and is therefore sometimes referred to as the "Colt M4" or "Oldsmobile M4."[2] It was primarily mounted in the Bell P-39 Airacobra and P-63 Kingcobra, with the U.S. Navy also utilizing it on many PT boats.