The Germans made pretty good use of their deck guns early in the war. Most of the time it was for finishing off damaged freighters but I believe that some were sunk with the gun on its own. As long as the hits are made below the waterline, it shouldn't take that many hits to sink a target. Although it's not historical to mount an American gun on a U-boat, the 127mm would be superior to the 105mm because of its larger caliber and more explosive filler.
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