Originally Posted by Rastoff

Just a little clarification here: you can't really do a "press check" on an M&P.

Because the gun has a Full Length Guide Rod(FLGR), the slide cannot easily be pressed back by pushing on the front of the slide. What we're really talking about here is a chamber check. To do this, the slide is grabbed from underneath with the fingers and thumb and slid back about 1/4" to 1/2". Just enough to see brass or not. The press check is done for the same reason, but is done by putting a finger on the guide rod cap and pressing the slide back. This can be hazardous because it puts your finger very close to the muzzle.

I always do a chamber check before I holster and before I unload. Yes, there is a chamber indicator, but, like others, I'm used to doing the chamber check. If done properly the slide will not stay back. The right way to do it includes closing the slide forcefully and thus eliminating the chance of not going fully into battery.