just purchased about a 4 month old sw 40 from an individual for a great deal and took it to the range today, shot nice, accurate and tried various ammo as i always do to make sure it will eat most anything you put through it, including corbon, speer gold dots and so forth. One thing that i noticed after the first mag was the slide release did not seem to function as most other semi autos. when a mag was empty the slide will remain open, replace mag and press mag release button and it would not just release the slide. I had to push the release button and pull the slide back just a little before letting it go and it would release and be ready to go. IS this common for the m&p pistols? this is the first one i have ever owned and i know my sigs, glocks, h&ks and taurus's do not function this way. Thanks in advance for any input.