Maybe S&W had a problem with that gun when it was going down the line and had to be test fired numerous times to ensure it was good to go out to the customer. What would you rather have, a clean gun with issues or one thats a bit on the dirty side but fires like a dream? Clean her up and fire away. By the way, my new 500 mag was dirty when I got it too, way more than a few down the pipe.... not a big deal.