User blog comment:Hayashi H/Grinding DDs and CLs on 3-2A/@comment-29051544-20161006174830/@comment-26002632-20161016042552

If you are talking about the 10cm Twin High-angle Gun Mount + Anti-Aircraft Fire Director, it is the best possible gun for a DD. Though if you don't have it he has a substitution guide for replacing it with other less good guns.