I had to send my M&P 40 back to Smith today for a light-strike problem. It was very intermittent and with varied ammo. It's a revision "M", so I was wondering if this would become a problem as it seems that the newer "N" revision has addressed this issue. The good news is that they will be installing the newer slide release lever at no charge also. Just a little disappointing, but I'm sure it will be very satisfying knowing that the updates will have been taken care of once I get it back.