I purchased this cover for a Simmons Gold Medal handgun scope. It fit on the objective without the need for any tapping or pounding. The one I purchased for the eyepiece was fine, but the objective cover kept popping open. It would not stay closed - even a slight bump would cause it to pop open.
I have used Butler Creek Flip-open scope covers for over 25 years on several rifles and pistols and never had a problem until now.
Cons: Not dependable. Keeps popping open.
This review was written in the old system and had content requirements that are different than reviews written today.