bobermo reply

M&P's have internal strikers, not hammers, and can not be cocked with the trigger. The only way to cock the striker is to rack the slide and on the forward movement of the slide, the striker is cocked. No the chamber cannot be loaded and uncocked. When the slide is racked back, the striker is cocked when the slide returns forward. It could be carried uncocked with an empty chamber if the trigger is pulled to release the striker, on an empty chamber.

The SA/DA guns like the Sig have a problem. If pulling the trigger with the hammer down (DA), the trigger pull is very long and a much heavier pull to break. Then the gun works as a SA with a very short and much lighter pull. This means you have to adjust to two different types of trigger pulls in one gun. No a good situation. The SA guns, which the M&P's really are, have only one trigger pull that you have to adjust to, which makes the gun much more suitable for a SD gun. No long pull, short pull to mess you up. The M&P's have the same pull each and every time.

Bob