I had my first jam while shooting my Smith and Wesson M&P 9 the other day. I actually didn’t know it had jammed until I took to back to the truck to re-load and noticed I still had 2 in the magazine and one stuck in the pipe.
I do not believe it was the M&P’s fault though. While loading the first magazine, I noticed a bad bullet in the box. When I went to load it, I felt the spot in my hand.