Angron is correct. You cannot change the position of your deck gun from bow to stern or vice versa. You are stuck with what you have. If you try to change the gun position the game will appear to let you, but that's when you have no available crew slots and the crew will not man the gun. You can but they will not. Make sure when you upgrade your deck gun that you put it in the same position and you'll have no problem.
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