Maybe this isn't a bug, more of a misplacement, but the 50 cal machine guns that are mounted on the lifelines would never be mounted there underway unless there was a specific force protection need for them or the ship was pulling in to port. Generally these things would be taken down and put in to the magazines otherwise there'd be some serious corrosion issues on them.
Not sure if this belongs here or not. And I suppose this isn't a huge deal if they stay.. just an observation.