Talk:15.2cm Twin Gun Mount/@comment-189.235.163.86-20150518215943/@comment-26334968-20150612095655

Or it could mean they intend to introduce the 12,7cm Type 1/Type 5 AA gun which was intended to replace the older AA guns.

http://www.navweaps.com/Weapons/WNJAP_5-50_t1.htm

Well the developers did introduce the protoype weapons such as the 20cm Type 3 no.3, 51cm twin and 41cm triple turrets!