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3- the thumb safety, grip safety, and half-cock safety.

I remember back in the early 70's at MP school at Ft. Gordon the instructor also mentioned that if you fall forward or in some way compress or put pressure on the barrel it would not fire. this would be a 4th safety. I also can't remember for sure but it seems that if the magazine is not locked in, it wont fire either. Not sure though, it's been a long time.

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13y ago

What else can I help you with?