I cannot find my S&W book. My local gun store has a 4 inch square butt pencil barrel M10 with a odd front sight that I am not sure if it is original. The back section is a ramp with the front cut like two sides of a triangle. Condition is 90% with rubber grips. Price $400 but I think I can get him down since it has been sitting in the case for 3 years. What do you think?