I purchased the Shield PC 9mm two weeks ago. I took it to the range this past Monday and it happened to me too. Jammed backed on the second magazine of the day, with several rounds remaining. I was shooting PMC Bronze 115 FMJ. It happened again about 40 rounds in. I shot a total of 100 rounds and it only happened those two times. I'm calling S&W Monday to get this resolved. Hopefully, a new barrel will be the answer. Thanks guys for the info.