Like John, I have my doubts that it was common for a soldier to file down the hold-open to disable it. That's not to say it didn't happen as people are capable of some incredible things but it's a valuable feature IMO for a soldier to know his pistol is empty.
It could also be that the magazine button isn't pressing upward enough to engage the hold open... again, as John has suggested.
Is there any way you could take a good, clear picture of the hold open in the pistol?
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