I use this mount on a Beeman R7 .20 cal. air rifle. It holds the scope firmly and has four srews to hold the base to the dovetails; nicely finished and stable! What I did learn about one-piece mounts is to insure you have enough dovetail groove to accomodate the entire length of the mount base. On the R7, about 1/4" of the scope mount is beyond the end of the dovetail grooves. It works, but I do check the screws for tightness frequently.
Pros: Holds scope firmly
Cons: None
This review was written in the old system and had content requirements that are different than reviews written today.