Took and Defensive Shooting class yesterday and when I returned home to clean my 23 the left rear guide was not there. The gun perfomed flawlessly during the entire class so I don't know when it happened. I keep a shooting journal and this gun has close to 9,000 trouble free rounds through it. I know a couple of years ago there were many threads on this which I'm not able to find. Would there be anyone out there that has gone through the process of getting this fixed be willing to share what they did in a post or past thread. Thanks for your responses.