I own a Taurus M85 and having seen the lock-work, I know that it is not a copy of S&W revolvers...not even close. However, I have never owned or seen the inside of a Charter Arms revolver, so I am ignorant as to if it is a S&W copy as far as the lock-work is concerned. I would appreciate it if someone who has a Charter Arms would take a picture of a Charter Arms with the side plate off so that I can see for myself what it looks like. The curiosity is killing me.