It was an automatic T20E1 37mm left side feed gun. The nose gun/cannon was not part of the original armament of the XA-20F.
It was added and tested at Wright Field.
Cheers!
Great album, I wonder what all the flags are on the side of the aircraft, in the bottom right pic. The Liberator in the background of the bottom left picture has had a bit of a whoopsie...
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