In situations where I can use the deck gun I tend to close to point blank range, so my crew don't have any problems hitting whether a deck gun qualification is present or not. I wouldn't shell anything that could shoot back.
I do give my WO a flak qualification though, but my crew still can't hit anything with it, but perhaps they are more effective once you have the meaner flak guns on your boat. I'm still using the single 2cm gun with the 20 round magazine, which seems pretty useless for AA defence.
Although it is good for shooting up small boats.
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