When I did prisoner escort or payroll guard, I was issued a 1911 with three rounds in the magazine, and not supposed to chamber until too late.. I always had a few extra of my own that they didn’t need to know about.
And there were a few times in a ‘warm zone’ on sentry duty, we had M-16s with an empty mag. Some of us had a full mag secreted somewhere, just in case.
A friend who had been in the National Guard years ago, told me about how they had been called out for riot duty and issued rifles from which the firing pin had been removed. He had his own personally-owned bolt with firing pin in his pocket.