Instruct: Classify an Amazon review as either positive or negative.
Query: Does not fit 3/8" dovetail

I should have heeded the other reviews. Although a very nice sight, it is too big to grasp a 3/8" dovetail.I purchased a Crosman 2240, added an extended barrel, modified bolt and a steel breech but can not use it because the red-dot sight would not mate to the 3/8" dovetail on the Crosman breech. I am very disappointed.The sight is on it's way back to Amazon.