Quote:
Originally Posted by jesterofsanity
The deck guns on the subs are, if I'm not mistaken, a very similar model to the "Bofors" AA guns on larger cruisers and battleships. So they are quite "dual purpose" in that sense. No reason why they shouldn't work on both-- assuming, as I am, that the AA guns on a battleship would be loaded with flak shells and not HE 
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The Bofors was a 40mm AA gun. It did find it's way on board subs but not as a deck gun. It could be used on small surface targets, but it's main job is AA