37 mm Automatic Gun, M4

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The 37 mm Automatic Gun, M4 is a series of American autocannons that fires 37x145mmR cartridge. These autocannons are only equipped on the P-39 Airacobra and the P-63 Kingcobra fighters.

History and development

The 37 mm autocannon had its root in 1921, designed by famed American firearms designer John M. Browning. Browning and Colt refined the design and was tested as the 37 mm T9 autocannon. It was accepted as the 37 mm Automatic Gun, M4, intended for a anti-aircraft weapon for intercepting and shooting down large aircraft.

The 37 mm cannon were mounted onto the P-39 and P-63 series of fighters, but proved unpopular with the pilots. The trajectory drooped harshly over distance and in night time operations, the muzzle flash could blind the pilot.

In War Thunder

The 37 mm autocannon on the P-39 and P-63 has the ability to delete most fighters if a 37 mm HE shells hit. However, the 37 mm suffer from poor trajectory and a relatively low rate of fire compared to other large caliber autocannons.

A specific note for the 37 mm belts in-game is that the Soviet P-39 and P-63 fighters do not have any belt options available. This is due to the historical note that US did not supply any armour-piercing 37 mm rounds to the Soviets as they did not consider the P-39 and P-63 for tank-busting duties.


M4 cannon





  • Very, very powerful HE rounds, which will often single shot most planes.
  • Usually has a decent ammo count for a round of the caliber.
  • AP rounds are actually decent against aircraft, provided you hit an important internal module, like turret gunners, the engine, or a wing spar.
  • "Default" ammunition is made entirely of HE rounds, making the cannon quite powerful from the start.


  • Very low shell velocity.
  • Tends to kick the nose of the plane up a lot, slowing it down (occasionally useful in landing).
  • Will jam quickly when fired for a short period of time.
  • Tends to scatter wildly when "warm".

M10 cannon





  • Higher Rate of Fire than M4 gun
  • Bigger ammo-drum than the M4 gun (58 rounds vs. 30 rounds).
  • "Default" belt is made entirely of HE rounds, making it quite powerful from the start.


  • Tends to scatter widly when "warm."
  • Slow shell velocity.

Additional information (links)