I ordered one when I had an XDm .40 and the XDm mags do not have as much girth as glock 19/23 mags. This made the mag really loose when I had it in the holster you linked to. I was able to remedy the loose mag by sewing part of opening shut. When I eventually traded the XDm and ended up with a glock 19 I removed the stitching from what I did. The looseness might not matter if you keep it in a front pocket. However I usually would carry this holster in a cargo pocket which would cause issues since those pockets were typically bigger.
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