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Bi Type 40mm Twin Autocannon Mount

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No.92 毘式40mm連装機銃
GreenGunMG.png Anti-Aircraft Gun
Effects: AA+6 Evasion+1
Scrap value: Ammo 2 Steel 1 (Unbuildable)

Equipment Card Bi Type 40mm Twin Autocannon Mount.png

Equipment Character Bi Type 40mm Twin Autocannon Mount.png

Equipment Item Bi Type 40mm Twin Autocannon Mount.png

Equipment Full Bi Type 40mm Twin Autocannon Mount.png

Refittable Class
Coastal Defense Ship Destroyer
Light Cruiser Torpedo Cruiser
Heavy Cruiser Training Cruiser
Aviation Cruiser Fast Battleship
Battleship Aviation Battleship
Light Carrier Standard Aircraft Carrier
Armored Carrier Seaplane Tender
Submarine Aircraft Carrying Submarine
Submarine Tender Fleet Oiler
Repair Ship Amphibious Assault Ship



This is an anti-aircraft autocannon introduced by the British Vickers Ltd. company.
Also known as the "pom-pom" gun due to its firing sound and its two-round burst, it was licensed but also produced domestically. It was gradually replaced by more modern anti-aircraft guns.


Anti-Aircraft Gun AA Guns are equipable in RE. They are mainly used to provide "Anti-Air", notably via their AA Anti-Air stat. They:

  • Are notably required in most AACI.
  • Trigger a tracer-fire effect during air combat.
  • Bring an accuracy bonus against PT Imp.

"AA Rocket Launchers" may be described and displayed differently, they still behave like regular AA guns.


How To Obtain

Stock equipment of: HarusameHarusame, TaigeiTaigei


Used to improve: Bi Type 40mm Twin Autocannon MountBi Type 40mm Twin Autocannon Mount

Updates History


Type Name Resource Day 2nd Ship Note
Fuel Ammunition Steel Bauxite Item Icon Development Material.png Item Icon Improvement Material.png # of equipment needed for that upgrade. An asterisk following the number indicates a different equipment is required. Sun Mon Tue Wed Thu Fri Sat
Anti-Aircraft Gun BI-type 40mm Twin Machine Gun 0 0 40 20 20 1/2 1/1 1xGreenGunMG.png Harusame
Upgrades to QF 2-pounder Octuple "Pom Pom" Naval Gun Mount ★+1
6 1/2 1/2 1xGreenGunMG.png
10 4/8 3/6 2xGreenGunMG.png
1xItem Icon New Model Armament Material.png
Improvement Improved effects
Anti-Aircraft Gun 1★ 2★ 3★ 4★ 5★ 6★ 7★ 8★ 9★ Max★
Firepower 1.00 1.41 1.73 2.00 2.23 2.44 2.64 2.82 3.00 3.16
Torpedo Attack 1.2 1.69 2.07 2.40 2.68 2.93 3.17 3.39 3.60 3.79
Anti-Air Ship 4.00 5.66 6.93 8.00 8.94 9.80 10.58 11.31 12.00 12.65
Accuracy Torpedo 2.00 2.82 3.46 4.00 4.47 4.89 5.29 5.65 6.00 6.32

See Also

QF 2-pounder naval gun