I have a leupold MK4, 4.5-14x50, duplex reticle, 30mm tube, side focus, M1 style knobs. The scopes are $970 new. I have a guy interested in buying my scope, but I am unsure of a price to throw at him. My scope does not have a scratch on it. I know leupolds hold there value, especially a MK4. Would $850 be a good starting price??