If you want to make sure you line up your target correctly, rely on the Leupold Open Range 30mm Medium Cross Slot Rings. These rings are designed to connect to Weaver-style bases and fit riflescopes with a 30-millimeter main tube, and they are made of 6061-T6 aluminum for a durable design that isn't too bulky. Leupold Open Range 30mm Medium Cross Slot Rings Black - Scope Rngs And Rifle Accessories at Academy Sports