I've got a Vortex Diamondback 1.75-5x32 mounted on my Schmidt Rubin K-31. I'm very happy with the scope. It's durable and holds a zero. I bought the scope for elk hunting in southern Oregon. The area where I hunt has a variety of terrain where shots might range from 30M to 250M. You will be hard pressed to find better scope in their price range. Also, the scopes are GUARANTEED FOR LIFE. Even if you aren't the original owner. They stand behind their product.