12cm Single Gun Mount Kai 2
[Edit]
No.293 12cm単装砲改二
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 Small Caliber Main GunEffects:
 +1  +1  +1  +1  ShortScrap value:
 1  1 (Unbuildable) | |
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| Refittable Ship Types | |
| 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 |
Introduction
旧型駆逐艦に標準的主砲として搭載された小口径主砲の改良型です。
装填・操砲も人力ですが、シンプルな構造で経済性も高く、駆逐艦や海防艦等の主砲として、長く使われました本兵装を戦訓を取り入れて改良、実戦時の運用性を大きく向上させています。
残念ながら対空射撃には不向きです。
An improved version of the small calibre main gun that was mounted as the standard main armament of older model destroyers.
Although it's loading and traverse mechanisms are still manual, it's simple design and low cost has allowed it to remain the main gun of destroyers and coastal defence ships for a long time. This upgraded version incorporates lessons learned during the war to significantly increase it's usability in combat.
Unfortunately, it is unsuitable for anti-air combat.
Note
Ranking reward for May 2018.
Bonus Stats
Mutsuki-Class / Kamikaze-Class Bonus
The 12cm Naval Gun Kai 2 provide the following bonuses to all Mutsuki Class and Kamikaze-Class Destroyers:
+2 , +3
Surface RADAR Bonus
When equipped with a Surface RADAR the following additional stats improve:
+2 , +1 
, +3
Overall, the stat gain using both the mentioned gun and Surface RADAR provides the following overall bonus to the Mutski-class and Kamikaze-class DD
+4 , +1 , +6
Shimushu-Class / Etorofu-Class Bonus
The 12cm Naval Gun Kai 2 provide the following bonuses to all Mutsuki Class and Kamikaze-Class Destroyers:
+1 , +1 
, +2
Surface RADAR Bonus
When equipped with a Surface RADAR the following additional stats improve:
+2 , +3 , +1 
Overall, the stat gain using both the mentioned gun and Surface RADAR provides the following overall bonus to the Shimushu and Etorofu-class DE
+3 , +1 , +1 , +5