Williams Diopter sights with 11mm dovetail mount. For all Crosman dovetail systems using steel breech's. Also fits 3/8'' dovetail rails on various other brands. Perfect for target style rifles.
Essential when using the steel breech kit on the Crosman 1322,2240,Doomsday and Discovery style recievers. The original sights on the above hand guns will not be able to be re-used once fitted with a steel breech.