These work great to open up the ring choices on a Ruger rifles. They work very well with the Zee Signature rings so you can dial in elevation on a Ruger rifle where you would normally need a 20MOA base on another brand of rifle. These along with the Zee Signature rings are all you need to turn a Ruger rifle into a long range rifle.
Pros: They work as they are supposed to, mount rock solid and are a good value.
Cons: None
This review was written in the old system and had content requirements that are different than reviews written today.