Instapark® One Piece High Power Magnum Airgun Scope Mount Stop Pin.
Fits all scopes with a one inch body tube * Mounts onto 3/8inch dovetail rails or grooved receivers * 33mm 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 * 5 Mounting screws give lots of clamping power and make the mounted scope firm and stay in place under recoil in every shooting situation * Full length of the mount is 4 3/4inch * Opening between two rings: 3inch * Works with typical full-size air rifle scopes around 12inch or longer