A short while ago I purchased a new M&P 9. I quickly became frustrated! It seemed to shoot reasonably well, however, at twenty yards it was 6 inches low. OK, no biggie, I could always take a little off the top of the front sight. What was more serious was the failures to feed. I stripped it down and cleaned and cleaned. I thought -it's new and needs to have a reasonable chance after some rounds are run through it. Last weekend it reached the point of , I'm either going to fix it or Monday it is going back to Smith. I used a punch to dive out the rolled pin that retains the extractor. Underneath was rust, the coil spring was rusted to the point where it appeared to be almost solid. Spraying it with CLP and using a stainless "toothbrush" appears to have taken care of that. The top and bottom of the extractor had shiny places were it was making uneven contact with the slide. A little judicious honing took care of that. The handgun had never been in the rain or gone "swimming". Apparently wiping the surface with an oily rag didn't get oil where it was needed and Smith doesn't include removal of the extractor as routine maintenance. Reading the manual, it's sort of frowned upon.