Thank you all for the comments. It is a 9mm.
One interesting note is that the underside of the rear toggle link is hand-serialized (823) to the pistol. It is the only other serialization I found other than the factory exterior serialization on the frame and receiver.
I haven't shot the Aimco much, but it's been fairly reliable with 124 gr FMJ. I purchased 3 additional magazines when I bought the pistol which were made for it. They are dimentionally slightly bigger than the mags I got from CDNN for a standard Luger.
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