M4 autocannon

37 mm Automatic Gun, M4
TypeAutocannon
Place of originUnited States
Service history
In service1942–1945
Used byUnited States
Soviet Union
WarsWorld War II
Production history
DesignerJohn Browning
Designed1921–1938
ManufacturerColt
Produced1939
VariantsM9, M10
Specifications
Mass213 lb (97 kg)
Length89.5 in (2.27 m)

Shell37×145mmR
Caliber37 mm (1.46 in)
Actionrecoil operation
Recoil9+58 in (245 mm)
Rate of fire150 rpm
Muzzle velocity2,000 ft/s (610 m/s)
Feed system30-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.

  1. ^ Bishop, Chris (2002). The Encyclopedia of Weapons of World War II. New York: Friedman/Fairfax Publishers. p. 161. ISBN 1-58663-762-2.
  2. ^ "Oldsmobile, Lansing, Shells, Cannons, and World War Two – Military History of the Upper Great Lakes".