Chris,
I had not seen that upper photo. You may well be right.
I was working on deductive logic, always an adventure into the swamp.
My thinking was that since the National Forge gun could not fire standard US ammunition without being modified (and it was extremely unlikely any of the guns in Australia would be shipped back to the US for that), it was possible someone got the bright idea to put the standard US ordnance from a light tank onto the mount to create a gun for which ammunition would be available.
However, you are probably right. A jury-rig job by a junkyard dealer.
Lee
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