''This is an improved version of No.3 Japan's 20.3 cm main gun for heavy cruisers.<br>It is a "what if" version of the 55 caliber heavy cruiser main gun that has been further matured, with an improved 6 m rangefinder, an increased firing speed, an improved ammunition structure and explosion prevention, and further ameliorations given to cooperate with radars.
==Mechanics==
==Mechanics==
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==Improvement==
==Improvement==
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{{AkashiWorkshopKai
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|DM_1= 7|DM_1g= 8
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|DM_2= 9|DM_2g= 14
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|IM_1= 4|IM_1g= 4
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|IM_2= 6|IM_2g= 7
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|Equ_1= 20.3cm Twin Gun Mount|Equ_1_qty= 4
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|Equ_2= 20.3cm Twin Gun Mount|Equ_2_qty= 8
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|Fuel= 20|Ammo= 140|Steel= 190|Bauxite= 40
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|Helper1A= Mikuma Kai Ni|Week1A= 0001111|Helper1AM= Mikuma Kai Ni/Toku