Sorry but when I see something like this I have to say something...What's your source on that?? I still see just as many posts asking "why does my M&P slide release when I insert a mag?" Just yesterday I watched one of the contestants on Top Shot insert at least two different mags into an m&P and watched the slide close on it's own. And yes this was a newer gun because it had the stepped rear sight. So again...if your going to say something like that I have to ask, what's your source?