Highly recommended to prevent movement of any scope on spring-piston airguns. Just slip on behind the scope mount and secure with included Allen wrench.
Magnum Scope Stop. Beeman R series rifles (except RX or RX-1, all HW, RWS, Diana, Original; Beeman 100, 200, 250, 400, Challenger; Falcon I, FX-1; Marksman 60-61, 55, 70)..
