Ok, I just recently purchased a model 649-5 .357 Smith and Wesson revolver it was manufactured in 2008 and has the locking mechanism. I also have a model 638 Airweight and it has a lock. I notice a lot of people want the pre-lock versions of these guns and sort of dismiss the ones with locks as though its some kind of big issue but never really explain why they don't like them. Why? I've owned my 638 since 2009 and carry it everyday day. Its never given me a problem what so ever so what is the big issue with the locks? BTW I'm a new member and have enjoyed reading the forums for many years now. Thank You!