Hello everyone. G23 owner since 2007. Bought this from a LE sale in Scottsdale, AZ...figured buying from a lower crime area meant that it hadn't been fired a ton of times, as well as abused from lots of handling. Would like to use this as my primary home defense gun, and as such would like to mount a light on it. However, with it being a gen 2, there are no rail mount options on the front. In researching options, I found out that my SN belongs to a group that doesn't have much info online. Mine is CKMXXX, and looking here: http://www.glocktalk.com/forums/showthread.php?t=1287557 the CKM group has little/no info on it. Was curious if anyone knew how I could also look up more info on this range of SN's. Thanks, and looking forward to learning a lot here!