Are dot sights springer rated?

My issue with the dot sights is that there is no magnification (on those that I have used). They work ok for large size targets at close range, but no so good for me at longer ranges. I have had 3 - and still don't like them. Since starting on airguns, I am no longer happy with MOA-soda can at 20 yards. I want to try to shoot "that hair" on the squirrel, rather than just in the general direction and hope to hit something.