Daniel,
The 7923 magazine, from the photograph, certainly seens to be authentic. You haven't mentioned the presence or absence of a small script letter under the serial number on the front of the frame; if indeed there is not one, it would appear that this Luger has a matching magazine. The + stamp on the mag base indicates that this magazine was the issued spare.
The unfortunate mark on the right side of the frame has nothing to do with the holdopen problem. Nothing more can be suggested on this situation until the gun has been taken down to see the inside of the frame.
--Dwight
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