Picked up a new 9mm Shield last week. Cleaned, lubed and off to the range. 80 rounds and 8-10 slide jams later (locked back, took a good rap to release), back to the store I went. Armorer at the shop where I got it thinks it might be the recoil spring. They didn't have a spare, so it's on its way to S&W. Not sure if it is the spring or the barrel issue I've seen noted in another thread. I just hope it gets fixed right the first time so I can put some rounds through it.