** Improvement: [[12.7cm Twin Gun Mount Model A Kai 3 (Wartime Modification) + Anti-Aircraft Fire Director]], [[Prototype Long-barrel 12.7cm Twin Gun Mount Model A Kai 4]] | ** Improvement: [[12.7cm Twin Gun Mount Model A Kai 3 (Wartime Modification) + Anti-Aircraft Fire Director]], [[Prototype Long-barrel 12.7cm Twin Gun Mount Model A Kai 4]] |