I have a guy a work that did the same thing with his Horton about four years ago. I could never understand how he did it. When I was bench shooting my Excal and my Horton in the past I would pretty much let the rest hold the CB and it would not move at all when fired with me just reaching around to squeeze the trigger. Sometimes I wonder if the guys that do it just happen to have there eye right on the scope and when they pull the trigger they have a bad case of trigger jerk and actually pull the scope into there own eye. My Multiretical scope has a nice crisp edge on it and it would not take much of a hit to make a small cut. The guy at work just barley broke the skin, but since I recognized it he told me it was from his scope. Like I say though, I just cant see how it happens with a CB?