You don't really need to go through all that. With the top barrel/extention completely off the pistol, insert an empty magazine into the frame and see how far up the mag button pushes the hold-open. If it does not come up at all or only slightly, try another magazine and see what happens. If there is a marked difference in HO height with the second mag, then the first mag is either seating too low or the button has isssues.
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