Type 99 Model 1 (20 mm)

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The P1Y1's frontal Type 99


The Type 99 Model 1 is one of the most common cannons used by the IJN. It can be found on the defensive turrets of quite a few bombers, as well as many early fighters. The cannon is on par with those of other nations, and it has a decent damage potential while having a low rate of fire.

Vehicles equipped with this weapon

Vehicles equipped with this weapon
A6M2  A6M2 · ␗A6M2 · ▃A6M2 · A6M2 mod. 11 · A6M2-N
A6M3  A6M3 · A6M3 mod. 22
J2M  J2M3 · J2M4 Kai · J2M5
N1K  N1K1
G4M  G4M1 (Defensive)
G5N  G5N1 (Defensive)
H6K  H6K4 (Defensive)
H8K  H8K2 (Defensive) · H8K3 (Defensive)
P1Y  P1Y1 mod. 11 (Defensive) · ␗P1Y1 mod. 11 (Defensive)

General info

Type 99 Turret firing demonstration

The Type 99 cannons are a bit tricky to use compared to German, Russian, or American counterparts. They have an extremely low rate of fire, of 450 rounds per minute, and poor velocity as well. Furthermore, the stock belts for these cannons are incredibly poor. However, these downsides come with advantages. These cannons have lots of explosive filler, especially in the Universal belt. They are the second most potent WW2 cannon in the game, due to 12 grams of TNT inside the rounds. Moreover, the seemingly small ammo count is actually made copious by the cannons' low rate of fire.

These cannons are always mounted in the wings of fighters. As a result, you will need to set your gun convergence to 300 or so, as these guns have low velocity. The guns are really good for dogfighting, as they are best used up close, as many Japanese aviators say.

Available ammunition

  • Default: T · HEF-I · HEF-I · AP-I
  • Universal: HEF-T · HEF · HEF · AP
  • Ground targets: AP-I · AP-I · AP · AP · HEF · HEF-T
  • Tracers: HEF-T
  • Stealth: HEF · HEF · HEF · AP · AP
  • Default (turret): T · HEF · AP-I
  • Armoured targets (turret): HEF-T · AP · AP-I · AP · AP-I
  • Air targets (turret): HEF · HEF-T · HEF · AP · HEF-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 22 20 15 10 7 5
Universal 22 20 15 10 7 5
Ground targets 22 20 15 10 7 5
Tracers 2 2 2 2 2 2
Stealth 22 20 15 10 7 5
Armored targets (turret) 22 20 15 10 7 5
Air targets (turret) 22 20 15 10 7 5
Belt details
Belt Type of
Mass (kg)
Fuse delay
Fuse sensitivity
Explosive Mass
(TNT equivalent) (g)
0% 50% 100%
Tracers HEF-T 588 0.13 0.3 0.1 6.05 79° 80° 81°

Comparison with analogues

Compared with guns like the MG 151, the Type 99 cannons are no match. However, these cannons have better damage output than most cannons of other nations. However, there is still ongoing debate regarding the Ho-5, Japan's land based fighter standard cannon. The Ho-5 performs consistently better than the type 99, as the Ho-5 is mounted in the nose, has double the rate of fire, and is excellent at sniping pilots. However, Ho-5's have poor ammo count, so the type 99 is better for pilots who want consistent, steady, slow damage.

Difference Between the Model 1 and Model 2

The Type 99 model 2 cannon is arguably better than the model 1. Although it has a lower rate of fire, the Model 2 cannon has really good belts that rip through enemy fighters. The model 2 also has improved accuracy, due to the longer barrel of the cannon.

Usage in battles

The cannon is very useful in close range dogfights, as the rounds usually rip a wing off very quickly. It is quite easy to land shots with these cannons. One very important thing to note about these guns is that the Tracer Rounds (HEF-T) only have HALF of the explosive mass than of the standard (HEF) round. Tracers do not give good damage output for this reason, and the more viable belt would be Universal, or Stealth.

Pros and cons


  • HEF has wonderful damage output
  • Universal belt can shred opponents in a short burst when well aimed
  • Useful in close range dogfights, combined with turn and burn tactics


  • Low velocity
  • Low rate of fire
  • Ammo count is meagre
  • HEF-I ammo lacks damage output results in a painful stock grind
  • Low penetration thus ineffective in a ground attack role
  • Poor as a defensive turret, cannot reliably down pursuing fighters


The Type 99 Mark 1 was adopted by the Japanese for both fixed and flexible installations. The fixed installation was developed first, as a fighter gun fed by a 60-round drum magazine, mounted in the wings of the famous Mitsubishi A6M Zeke or Zero. A flexible version, initially developed for the Mitsubishi G3M bomber, was inverted to put the ammunition drum below the line of sight of the gunner. Smaller drums (15, 30 or 45 rounds) were used on flexible installations where space was limited.

The limited ammunition capacity was an important disadvantage. The Type 99 Mark 1 Fixed Model 3 could be equipped with a 100-round drum, but the size of the drum was itself a problem in fighter installations, although the Model 3 guns were installed on the initial production versions of the A6M3. A more practical solution was provided by the Type 99 Mark 1 Fixed Model 4, which featured a Kawamura-developed belt feed mechanism..


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

See also

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)

Japan aircraft cannons
20 mm  Ho-1 · Ho-3 · Ho-5 · JM61A1 · Type 99 Model 1 · Type 99 Model 2
30 mm  Ho-155 · Type 5
37 mm  Ho-203 · Ho-204 · Type 94
40 mm  Ho-301
57 mm  Ho-401
75 mm  Type 88
20 mm  M61 (USA) · M197 (USA) · MG FF (Germany) · MG FF/M (Germany) · MG 151 (Germany)
30 mm  M230E-1 (USA)

China aircraft cannons
23 mm  Type 23-2K · Type 23-3
30 mm  Type 30-1
20 mm  AN/M2 (USA) · B-20E (USSR) · Hispano Mk.II (Britain) · Ho-3 (Japan) · Ho-5 (Japan)
  M39A1 (USA) · M39A2 (USA) · M61A1 (USA) · ShVAK (USSR) · Type 99 Model 1 (Japan)
23 mm  NR-23 (USSR) · NS-23 (USSR) · NS-23K (USSR)
37 mm  Ho-203 (Japan) · N-37D (USSR)