Thats great.The fact still stands that its not supposed to do it. What is so difficult to understand about that? In my experience, I did not slam in the magazine. I slid it up to the locking position and the slide slammed shut.I tried the same thing with the Glock 17 I had rented also, the slide stayed open. I Did the samething on my Sigma, the slide stayed open and I did it on my Colt 1911 and what do ya know the slide stayed open. I bought the Glock 17/G3 and I am happy with it. Maybe when I am ready to purchase another gun I will look at Smith and Wesson again. I do not want to buy a gun that malfunctions fresh off the GS shelf. I thought that I would get that with an M&P and after researching it i would have. Maybe I'll go with the Rock Island 1911 next time or maybe the CZ or the FNH. Maybe the Beretta, My prior service weapon. I do not want to deal with a company that says to me "Our gun is **** and we are going to take your hard earned money and seel it to you anyway because we don't care what one guy thinks, we care how many guys we can rip off and get away with it.