I have 2 of the Mark AR 3-9x40 scopes. They are a nice scope. I think if I were to do it over again I would get the Mark AR 1-4x20 or the Weaver 1-3x20. In fact I may sell the new , never mounted one and get the Weaver. If you are planning on shooting at a distance the 3-9 is great, but if your action is closer I would use a lower power. They have nice glass, the bullet drop works with the right ammo, and they have a lifetime warranty.