In the Pacific, the P-61's 4-20 mm were adequate to deal with Japanese aircraft structure.
Perhaps part of the mount in the thread-origin photo had its origin in the "informal supplies network" in that area of ops?
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It looks like the arrangement of the MGs is the same as the dorsal quad 50 on the P-61 Black Widow. If this photo does not work maybe the address will.
https://ww2db.com/image.php?image_id=28703
Rich
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