I have picked up my Shield 9mm today and have 7 or 8 fail to extract issue as the spent casing would stay half way in the chamber. It appeared that the extractor does not have enough tension to hold onto the rim of the spent casing for a complete extract. The gun was cleaned and lubed prior to firing. I will contact S&W for customer service and will keep all posted. This is my first M&P pistol as I was going to give this a try and possibly switching from my Glock 17 to M&P 9s for duty use. I guess I will have to hold off and see how this issue is resolved.