Are you saying that even though your M&P has "CAPABLE OF FIRING WITH MAGAZINE REMOVED" etched on the slide that your does indeed have the magazine safety? Did you buy it new? If so I would call S&W customer service @ 1-800-331-0852 x2905 and see what they say.
I was looking at some fine pics a poster put up on this forum and shared them with some friends when one of them said "I thought your new pistol had a safety that would not allow this to happen". I immediately jumped on here to ask since I couldn't remember if mine had the engraving or not.
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