I am new to this forum and I was wondering about my S&W Cheifs Special, model 36. It is older, nickeled and has a square butt. Are these rare? I think most of the guns in this model have a round butt. I also bought a S&W 617 in 6 inch a couple of months ago. It is a '99 model (pre-lock) and it has a round butt. Any info on either gun would be appreciated.