I couldn't find any indication that the model 4 dorsal gun was in a different location than the model 5 turret, which is manual, BTW, nor armed differently, which makes me wonder why bother.
I did find that diagram, which was very helpful.
Gunnery arcs can be open to interpretation. I usually start with ADCs from the games from the Fighting Wings line, or their semi-official ones from Uncle Ted's now dark site. (fortunately, I saved them all )
There's a lot of looseness in the official arcs; with fixed forward guns, you have a pretty wide forward arc, and can get a hit if you can get to any part of the base/card.
That's a lot of target access actual pilots didn't have. Same for the flexible, defensive guns; no deflection rules, and they can hit anywhere in their fields of fire, phase to phase.
I tend to be a bit more conservative with my gun arcs, some official diagrams show gunners shooting in directions I think they'd need to be leaning out of their cockpits to achieve.
Karl
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