Looking at my used brass over the last few range sessions as I was counting it into bags tonight (must really be needing to shoot and I'm at least a week from the range) and noticed that on just about all of the cases there is a small ding in the brass about halfway up. It took me a while to notice, but once I did I saw that the dent is in exactly the same place every time across several hundred cases. (a sampling of the total from a few days shooting...I'm not that bored!) All were shot from my new-to-me Kimber that has been flawless for over 500 rounds. Reading over several posts I'm guessing this is an extractor issue, but I've not seen anyone else mention a recurrent case mark as any symptom of anything. It is a very small ding, but noticeable on every case. It doesn't appear to be more than a few millimeters deep. It hasn't affected functioning thus far, but I don't want to ignore a potential trouble spot. The shop I bought it from claims to inspect all its used guns through the in-house smith and that they won't sell it if its unsafe so I'm not tooooo worried. Any help would be appreciated as I'm really just looking for some reason to spend more money on my new toy.