I went out to retired day at the police range. One of the instructors had a S&W key. She checked the lock on my snubbie and told me that sometimes people don't turn it completely to the stop. She said if you don't get it completely turned it can engage while you are shooting it. I said that I had heard of the S&W locks engaging while shooting and that was an issue. She said just to make sure it was completely disengaged and I wouldn't have a problem. Interesting.