Dual Automatic Gun M2 (40 mm)

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Description

The 40 mm Dual Automatic Gun M2 is a heavy autocannon used mainly by the United States, occasionally finding use amongst the British and the German vehicles. Introduced around the Second World War, the Dual Automatic Gun M2 gave itself a good name due to its reliability as a cannon and general effectiveness.

Vehicles equipped with this weapon

General info

The Dual Automatic Gun M2 has a medium rate of fire.

Available ammunition

  • Default: AP-T · FI-T*
  • Mk.II: FI-T*
  • M81A1: AP-T

Penetration statistics
Ammunition Type of
warhead
Penetration @ 0° Angle of Attack (mm)
10 m 100 m 500 m 1,000 m 1,500 m 2,000 m
Mk.II FI-T* 3 3 3 3 3 3
M81A1 AP-T 72 69 58 46 37 29
Shell details
Ammunition Type of
warhead
Velocity
(m/s)
Projectile
mass (kg)
Fuse delay
(m)
Fuse sensitivity
(mm)
Explosive mass
(TNT equivalent) (g)
Ricochet
0% 50% 100%
Mk.II FI-T* 874 0.83 0 0.1 63 79° 80° 81°
M81A1 AP-T 875 0.88 - - - 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

Pros:

  • Powerful 40 mm HEF-I shells (Mk.II) with high amounts of explosive filler that can shred planes to pieces with successful 1 hit
  • The M81A1 AP rounds can easily deal with sides of medium tanks and can damage cannon barrel and tracks
  • Acceptable muzzle velocity for the gun
  • Acceptable rate of fire

Cons:

  • The 40 mm shell penetrates up to 76 mm of armour, not enough to deal with some German SPAAs
  • Muzzle velocity and rate of fire are not really good
  • High leading angle is needed to hit the enemy aircraft
  • Not suitable gun for higher tiers, especially against jets

History

The United States started production of the Swedish Bofors L/60 under very unusual circumstances. While an example was purchased by the Navy Bureau of Ordnance for testing arrived on United States Army USAT American Legion, that same month, the Bofors was demonstrated by the Dutch Navy which convinced the United States Navy to adopt the design. However, Sweden's request for airplane exports and manufacturing licenses in a quid-pro-quo stalled the agreement for the United States to license-build the design until June of 1941. It is alleged that prior to acquiring this license, the British sent schematics for their Bofors guns in imperial measurements. Regardless of how they acquired the design, the United States put Chrysler in charge of producing guns for the United States Navy, and by 1942, the Army having tested British Army Bofors guns, started adopting them too, replacing their locally designed 37 mm M1A2 as the Army and Marine Corps anti-aircraft gun of choice.

The US Army designation of the Bofors L/60 is the 40 mm Automatic Gun M1. The development of a self-propelled anti-aircraft variant began with the T65 which was a Bofors L/60 mounted on the chassis of the M5 Stuart light tank, however, the M5 was being phased out of production in favor of the newer M24 Chaffee. To increase the firepower available, the new M24 based design was fitted with a dual-mount of air-cooled 40 mm Bofors L/60 guns designed the Dual Automatic Gun M2 by the US Army. The end result was the M19A1 Multiple Gun Motor Carriage.

While the priority for Chaffee tanks meant the design was too late to see service in Europe, the M19 would see action during the Korean War, most notably during the Battle of the Chosin Reservoir and the Battle of the Pusan Perimeter. In 1951, a handful of M19s were delivered to the Netherlands. In 1954, the newly formed Japanese Ground Self-Defense Force received the design. When the Army began the replacement of the M24 Chaffee during the Korean War with the newer M41 Walker Bulldog, they simply took the M19's turret and modified it to fit on the M41's larger turret ring to create the M42 Duster. However, during the 1950s, the US Army concluded the Bofors gun was obsolete in the new jet age and retired the design for the HAWK Surface-to-Air-Missile. However, the HAWK had a poor performance in Vietnam and so the M42 was brought out of retirement for low-altitude air defense and served in a ground support role too. The Bofors L/60 still sees service in the US on the AC-130 gunship, but the M2 dual automatic gun was retired with the M42 Duster in 1988.

Media

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See also

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

External links

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  • topic on the official game forum;
  • other literature.


Britain and USA anti-aircraft guns
7.92 mm  BESA
12.7 mm  M2HB
20 mm  GAI C01 · M168 · Oerlikon Mk.II · Polsten
25 mm  GAU-12U
30 mm  HSS 831L
35 mm  GA-35 · Oerlikon KDA
37 mm  M1A2
40 mm  Bofors L/60 · Dual Automatic Gun M2 · M266

Japan anti-aircraft guns
20 mm  Type 98 Anti-Air Gun
  Foreign:
12.7 mm  M2HB (USA)
20 mm  Rh202 (Germany)
35 mm  Oerlikon KDA (Swiss)
40 mm  M2 Dual Automatic Gun (USA)

China anti-aircraft guns
12.7 mm  M2HB (USA)
25 mm  PG87
35 mm  PG99-35-2
37 mm  Type 65
40 mm  Dual Automatic Gun M2 (USA)
57 mm  WA318