In the first 425 rounds, 7 light primer strikes, 2 stovepipes and a trigger that felt mushy. I sent it back to S&W. They returned it with a new recoil rod and spring, said they modified the barrel and trigger. The feed ramp was polished and the throat opened up, not sure what they did with the trigger. Yesterday I put 273 mixed JHP and FMJ down the pipe with no malfs. The trigger is still long and hard (that's a good thing, right?) but the mushy feel is gone and you know when it is about to break. My neighbor is retired NYPD and he said it was the best DAO he has ever fired. It has an all together differant feel to it now. Before you sell, modify or change springs I would let S&W do the voodoo they do so well. Ten days turn around and they pay shipping!