Well, rats. I just noticed another Kitty Hawk error that is in the gun bay. They misinterpreted a photo and in effect added a third ammo can as a "block" on the aft bulkhead of the bay. See today's update here: http://tailspintopics.blogspot.com/2016/09/kitty-hawk-148-f2h-22p-banshee.html
This post also includes illustrations of the gun sight needed for the fighter version.
Good spot, I didn't notice that, but I was really looking at any inaccuracies as you technically cant use the gun nose out of the box.
It does seem strange that KH would add that block in there when no photos show it. Also it means the two ammo boxes have been moved forward as well to incorporate the third box.