Speaking of the 5" deck gun, it's important to note that surface ships generally used the 5"/38 gun, whereas the subs used the 5"/25 gun. The biggest difference being that the surface ship gun is 65 inches longer. If the 5" gun that we have at the museum is on a surface ship platform, then more than likely it's a 5"/38. I don't think that we should substitute one for the other on the boat.