This is a Clamp on Style Scope Stop with lock set screw and rubber bumper. Spring piston airguns can have a violent shooting behavior. Scope stops assist in holding the scope rings from moving due to the sudden quick snap of the spring. These should fit any 9.5mm-11mm scope rail. They are approximately 25mm long and 8mm high. I would try this without using the stop pin first. Stop pins can mark up the surface if precautions are not taken. I use to cut a small disc/shim from a soda can to go under the screw. If the gun has a lock pin hole a second shim was added for the side of the screw to bear against. That way the lock screw bears down on the shims which will usually prevent the screw from marking up the gun. Some applications may require a longer stop screw, every setup is different. Make sure you have the needed clearance height under your scope.

Comes with: 1 Scope Stop, 2 Different length stop pins, 2 Allen keys.