Would like to put a vx1 leupold 3x9 scope on my 45-70 marlin lever action guide gun. My brother has the same scope but it's a 2x7 with a 30mm objective with medium scope rings that clears the factory sights. The 3x9 I want has a 40mm objective. Does any one know if I can use the medium rings or do I need the high to clear the sights.