I was talking to a friend of mine (who happens to be in Law Enforcment) and said he would buy a Glock if it had a manual safety. I was looking in my Brownells catalog and they have one. It comes with a Jig so u can make the 3/32 cut and the safety. Is it worth it? I wouldn't mind trying it on one of my Glocks, but I'm afraid it might hurt the dependability. Glock made one model with a thumb safety for the Tazmanian Police Force but I think there is a pretty good reason they don't offer it.