First, you need to understand that every rifle scope has a different purpose. One scope might be the best for long-range shooting and another for close-range shooting. Some scopes have superior light transmission and quality of glass, but are not as effective when it is time to make adjustments. Not all scopes are created equal. Each scope comes with its own standards. You may be able to find the right scope for you if you are lucky enough. Vortex Optics Strike Eagle is an example. Let's assume you need a scope capable of close-range shooting. It should offer maximum magnification, and be easy to adjust. A rifle scope should be specifically made to suit your needs. It is undoubtedly surplus if the scope has other features.