It's something the called a "creedmoor" sight years ago. It's some what service able, but the little windage adjustment it has are gained by turning the little screws on the base. That in turn will also make an elevation change so a person has to be pretty sharp on figuring out how many "minutes" windage a turn on the knobs makes, and then make the corresponding elevation changes.
Person is much better served by getting a quality soule sight.