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.
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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.