Unknown turret

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The vertical alignment seems to be the only alternative as clearly there is no turret ring. As to the actual a/c?

If the mount swivels 'laterally' only (for a vertical mount) - it would not be a very interesting deterrent to a trailing fighter. On the other hand - if it was set to be 'fixed' for forward battery, why provide what seems to be a rotating mount on either side of the battery except for perhaps access to load and feed?
 
Here are three pictures of the B-29 upper forward four gun turret, next to T Square 54, a B-29 being restored at the Museum of Flight in Seattle. You can see that the middle two guns are raised enough to allow the ammunition belts to easily feed into each breech. And you can see the separate sprockets driving each belt. The sprockets are driven by single motor through gears.





 
I think it is the D-2 turret

And if anybody was wondering someone is actually trying to sell the patent for the D-2 on Ebay.. Found that out when I was searching for pictures of the tail
 

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