Yes, the upper guns have indeed been removed on this Me 262. The upper gun troughs have been likewise faired over. However, I was actually referring to the spent shell ejection ports, which are the dark rectangular, slanted things just outboard of the bomb pylons.
There are lots of photos that show the upper gun troughs faired over on Me 262 A-2a's (thought not on all). I'm just a bit surprised to see spent shell ejection ports plugged in, as I've never heard of this happening, nor have I noticed it in photos before. But I suppose it would stand to reason that if the upper cannons are removed, then the shell ejection ports, whose cartridge ejector chutes are connected with those cannons, can likewise be faired over since they would no longer be needed.
I've attached below a photo of another Me 262 A-2a, 9k+YH. On this machine, the upper cannon troughs are faired over, but the shell ejector ports are untouched. This seems to have been more typical.
http://i304.photobucket.com/albums/n...psujcv6qi1.jpg
Thoughts?