|[[Prototype 51cm Twin Gun Mount]]<ref name="2ARM">Requires 2 Armament Materials.</ref>{{·}}[[16inch Mk.VIII Twin Gun Mount Kai]]<ref name="2ARM"/> | |[[Prototype 51cm Twin Gun Mount]]<ref name="2ARM">Requires 2 Armament Materials.</ref>{{·}}[[16inch Mk.VIII Twin Gun Mount Kai]]<ref name="2ARM"/> |