I had a close examination of a S&W MP 40 at the NTOA in Las Vegas in September. The pistol looked promising at first. It felt good and pointed great. I liked the way they copyed the SIG Pro's, tough, removable and massive steel inserts in the frame. Grip was nice and like was said before, interchangable for size.
The big dissapointment was when I tried to strip it down. I locked the slide back and rotated the frame mounted take-down lever down-ward. (Very nice touch and copyed from the SIG P220 series.) The S&W rep dove across the table and lost his mind. After taking the gun from me he took a slender plastic tool that was contained inside the rear grip of the frame behind the mag. It just rotates and locks into the grip. Then with use of a flashlight he showed me how to "carefully" rotate a small, tiny, (pathetic) sear spring down-ward into the mag well. This disengages the firing mechanism of the weapon so the slide can be released and taken off of the gun without breaking it. (Turns out he only had one MP sample and didn't want to break it during the show.)
What this allows for is that the gun does not have to be dry fired before stripping like a glock (or sigma).
Neadless to say I was apalled. Just when I thought that S&W had finally made a good gun I was disapointed yet again.
Just my 2 cents. I didn't get to shoot it but it did feel great so I imagine it is a good shooter.
Rich.