I first thought these were a great idea, but then I installed them and could not get front and back aligned.
If they are not aligned and you tighten down the scope, chances are you can damage elevation-windage adjustment inside the scope. This is product only for experts. I will stick with Weaver quadlok from now on.
Pros: windage adjustable
Cons: front and back are easy to get out of alignment
This review was written in the old system and had content requirements that are different than reviews written today.