The 37mm Gun, M3 is an American anti-tank gun.


37mm Gun, T3
The first prototype.
37mm Gun, T7
A prototype with semi-automatic horizontal sliding block breech.
37mm Gun, T8
A prototype with Nordenfelt eccentric crew breech.
37mm Gun, T10
Standardized as M3 in 1938, manual vertical block breech.
37mm Gun, M3
Towed version, manual breech.
37mm Gun, M3A1
Version with threaded barrel end to accept a muzzle brake, which was never issued.
37mm Gun, M5
37mm M5

37mm M5

Tank mounted variant with shorter barrel.
37mm Gun, M6

Tank mounted variant with original barrel length and semi-automatic breech.


T5 / M4
Adopted version.
Improved traverse controls.
Airborne Carriage
In 1942, Airborne Command requested a version with removable trails. A prototype was tested, but in 1943 the project was deemed unnecessary and was dropped.


Ammunition came in boxes marked 37x223R, Cartridge Case M16.

AP M74 Shot
AP-T - Armour Piercing Tracer
  • Overall Weight: 1.51kg
  • Projectile Weight: 0.87kg
  • Muzzle Velocity: 884m/s
  • Penetration @ 457m/0°: 36mm
  • Penetration @ 914m/20°: 25mm
APC M51 Shot
APCBC-T - Armour Piercing Capped Ballistic Cap
  • Overall Weight: 1.58kg
  • Projectile Weight: 0.87kg
  • Muzzle Velocity: 884m/s
  • Penetration @ 457m/0°: 61mm
  • Penetration @ 914m/20°: 53mm
  • Penetration vs homogeneous @ 457m/30°: 53mm
  • Penetration vs homogeneous @ 914m/30°: 46mm
  • Penetration vs homogeneous @ 1,371m/30°: 40mm
  • Penetration vs homogeneous @ 1,828m/30°: 33mm
  • Penetration vs face-hardened @ 457m/30°: 46mm
  • Penetration vs face-hardened @ 914m/30°: 40mm
  • Penetration vs face-hardened @ 1,371m/30°: 38mm
  • Penetration vs face-hardened @ 1,828m/30°: 33mm
HE M63 Shell
HE - High Explosive
  • Overall Weight: 1.42kg
  • Projectile Weight: 0.73kg
  • Filler: 39g TNT
  • Muzzle Velocity: 792m/s
HE - High Explosive
  • Overall Weight: 1.23kg
  • Projectile Weight: 0.56m
  • Filler: 27g TNT
Canister M2
  • Overall Weight: 1.58kg
  • Projectile Weight: 0.88kg
  • Filler: 122 steel balls
  • Muzzle Velocity: 762m/s
TP M51 Shot
TP - Target Practice
  • Overall Weight: 1.45kg
  • Projectile Weight: 0.87kg
Drill Cartridge M13
The M13 cartridge was meant to simulate the APC M51 Shot.
  • Overall Weight: 1.45kg
  • Projectile Weight: 0.73kg
Drill Cartridge T5
The T5 cartridge was meant to simulate the HE M63 Shell.
  • Overall Weight: 1.45kg
  • Projectile Weight: 0.73kg
Blank Cartridge 10-gauge with adapter M2
  • Overall Weight: 0.93kg
USA 1912 Weapons of the United States of America during the Second World War USA Army
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Melee Weapons Ka-BarM1 BayonetM3 Trench KnifeM1917 BayonetM1942 BayonetMarine Raider StilettoMark I Trench Knife
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General Purpose Machine Guns / Medium Machine Guns M1917M1919 (A1A2A3A4A6)
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Anti-Tank Guns 37mm T337mm M337mm M3A137mm T737mm T857mm M175mm M18973-Inch M590mm M290mm T8105mm T8
Coastal Artillery 3-Inch M19023-Inch M190390mm M16-Inch M18976-Inch M19006-Inch M19036-Inch M19056-Inch M19086-Inch M16-Inch T212-Inch M189012-Inch M189512-Inch M188812-Inch M190014-Inch M190714-Inch M190914-Inch M191016-Inch M189516-Inch M191916-Inch M192016-Inch Mark 216-Inch Mark 3
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Standard Tank Guns 37mm Gun, M537mm Gun, M6M1924 (A1)37mm T2175mm M275mm M375mm M676mm M1 (A1A1CA2)76mm T13-Inch M590mm M3 (A1)105mm Howitzer M4105mm T8
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Spotlights Canal Defence Light
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Naval Cannons above 30mm 37mm M9
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