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Bofors 40mm Quadruple Autocannon Mount

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No.173 Bofors 40mm四連装機関砲
GreenGunMG.png Anti-Aircraft Gun (Concentrated)
Effects: Firepower+1 AA+11 Armor+1 Accuracy+1 Evasion+2
Scrap value: Ammo 6 Steel 1 Bauxite 3 (Unbuildable)

Equipment Card Bofors 40mm Quadruple Autocannon Mount.png

Equipment Character Bofors 40mm Quadruple Autocannon Mount.png

Equipment Item Bofors 40mm Quadruple Autocannon Mount.png

Equipment Full Bofors 40mm Quadruple 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



The shipborne, quadruple-mounted version of the Nordic-created worldwide bestselling 40mm anti-air autocannon.
The base version of the gun was considered a masterpiece and as such was adopted by many countries including the enemy forces.
Proving to be excellent at short-range surface-to-air fire, it was equipped on many US and British Navy vessels as well.


Anti-Aircraft Gun AA Guns are equippable 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.


Not to be confused with other guns of this manufacturer (see here).

How To Obtain

Stock equipment of: Gotland KaiGotland Kai, Gotland AndraGotland Andra (★+4), Iowa KaiIowa Kai

Ranking reward for:

  • Mar 2016: 1-5, 6-20, 21-100, 101-500

Event reward for:

Updates History

  • 2016-04-25: Implemented as ranking reward
  • 2020-09-17: Stats increased: Anti-Air+10 → Anti-Air+11


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
[math]\displaystyle{ \text{AdjAA}_\text{ship} }[/math] 6.00 8.49 10.39 12.00 13.42 14.70 15.87 16.97 18.00 18.97
Accuracy Torpedo 2.00 2.82 3.46 4.00 4.47 4.89 5.29 5.65 6.00 6.32

See also

Bofors 40 mm Gun