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37 mm Automatic Gun, M4
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 her 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.
^Bishop, Chris (2002). The Encyclopedia of Weapons of World War II. New York: Friedman/Fairfax Publishers. p. 161. ISBN 1-58663-762-2.
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