Why are 105 mm tank, artillery, and naval gun barrels not interchangeable?
Short answerNaval barrels tend to be longer, thicker, and heavier because a ship can carry the weight; the stated benefit is slower wear and less frequent replacement.
NotesA shared 105 mm calibre does not make tank, field-artillery, and naval barrels interchangeable. Naval barrels tend to be longer, thicker, and heavier. Ships can accept that additional weight more readily than land mounts. The durability argument offered here is that thicker barrels wear more slowly and need replacement less often.