One Piece Dovetail Scope Mount with Stop Pin for High Power Magnum Airguns Fits all scopes with a one-inch body tube. Mounts onto 3/8inch dovetail rails or grooved receivers. 35mm center height, good for mount scope with adjustable objective size up to 50mm. Removable threaded stop pin is built in and can be activated easily. 4 Mounting screws give lots of clamping power and make the mounted scope firm and stay in place under recoil in every shooting situation. The full length of the mount is 3.93 inches. Opening between two rings: 2.28 inches. Works with typical full-size air rifle scopes around 12 inches or longer.