M4 (37 mm)

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This page is about the aircraft cannon M4 (37 mm). For the tank armament, see M4 (105 mm). For other uses, see M4 (Disambiguation).


The M4 (37 mm) (officially the 37 mm Automatic Gun, M4) is an American autocannon firing 37x145mmR cartridges. It is predominantly seen on the P-39 Airacobra series of fighters, and on the early P-63 Kingcobra fighters as well (namely the P-63A-5 and ▂P-63A-5 in-game).

Vehicles equipped with this weapon




General info

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 calibre 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 the 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.

Available ammunition

  • Default: HEFI-T* · AP-T
  • Air targets: HEFI-T*
  • Universal: HEFI-T* · HEFI-T* · AP-T
  • Ground targets: AP-T
Penetration statistics
Belt Penetration @ 0° Angle of Attack (mm)
10 m 100 m 500 m 1,000 m 1,500 m 2,000 m
Default 37 35 30 24 19 15
Air targets 3 3 3 3 3 3
Universal 37 35 30 24 19 15
Ground targets 37 35 30 24 19 15
Belt details
Belt Type of
Mass (kg)
Fuse delay
Fuse sensitivity
Explosive Mass
(TNT equivalent) (g)
0% 50% 100%
Air targets HEFI-T* 610 0.61 0.05 0 65.83 79° 80° 81°
Ground targets AP-T 556 0.75 N/A N/A N/A 47° 60° 65°

Comparison with analogues

Give a comparative description of cannons/machine guns that have firepower equal to this weapon.

Usage in battles

Describe the cannon/machine gun in the game - its distinctive features, tactics of usage against notable opponents. Please don't write a "guide" - do not impose a single point of view, but give the reader food for thought.

Pros and cons


  • 30 rounds loaded, can last an entire round with good trigger discipline.
  • One hit will usually either directly destroy a single engine fighter or damage it enough to prompt the pilot to return to base
  • Particularly good in a close range snapshot situation, quickly ending a dogfight


  • Very slow muzzle velocity, requiring a lot of lead to score a hit in a dogfight
  • Self destroying HE shells, which limits the range at which they can be used.
  • Absolutely useless AP shells, which struggles even with light tanks.
  • Very slow rate of fire
  • Inaccurate, NEVER count on it during a head on fight


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.


Excellent additions to the article would be video guides, screenshots from the game, and photos.

See also

Links to the articles on the War Thunder Wiki that you think will be useful for the reader, for example:

  • reference to the article about the variant of the cannon/machine gun;
  • references to approximate analogues by other nations and research trees.

External links

USA aircraft cannons
20 mm  AN/M2 · Browning-Colt Mk12 Mod 0 · Browning-Colt Mk12 Mod 3 · FMC T-160
  M3 · M24A1 · M39A1 · M39A2 · M39A3 · M61 · M61A1 · M195 · M197 · Mk 11 · Mk 11 mod 5 · T31
30 mm  M230E-1 · XM140 · GAU-8/A · GAU-13/A
37 mm  M4 · M9 · M10
40 mm  M129
75 mm  M10 · T13E1
20 mm  Hispano 404 (France) · Hispano Mk.II (Britain) · MG 151 (Germany) · Type 99 Model 1 (Japan)
30 mm  ADEN Mk.4 (Britain)

USSR aircraft cannons
20 mm  B-20E · B-20M · B-20S · ShVAK
23 mm  GSh-23-2 · GSh-23L · NR-23 · NS-23 · NS-23K · PTB-23 · VYa-23
30 mm  2A42 · GSh-6-30 · GSh-30-2K · NR-30
37 mm  N-37 · N-37D · NS-37 · SH-37
45 mm  NS-45
20 mm  Hispano Mk.II (Britain) · MG 151 (Germany)
37 mm  M4 (USA) · M10 (USA)

France aircraft cannons
20 mm  GIAT M.621 · Hispano 404 · Hispano HS.9 · M50
30 mm  DEFA 541 · DEFA 551 · DEFA 552 · DEFA 552A · DEFA 553 · GIAT M781
20 mm  AN/M2 (USA) · Browning-Colt Mk12 Mod 3 (USA) · Hispano Mk.II (Britain) · M3 (USA) · M24A1 (USA) · M39A1 (USA) · MG 151 (Germany) · ShVAK (USSR)
37 mm  M4 (USA) · M10 (USA) · NS-37 (USSR)