Talk:Equipment/@comment-3578462-20140105054101/@comment-24161900-20140105150535

Extremely useful. You won't notice it untill world like, 4-4 where you start encountering a lot of flagship BB's. Even my Kongou Kai 2, who's level 92 with type 22 + 33 surface radars, was out-damaged by my level 4x nagato who had AP ammo.

Basically it increases your chance of piercing the opponents armor, which is the critical hits in this game. from world 4-2 and beyond, you really need a Nagato class BB, because for gods sake the flagship BB's are tanky as all hell.