I have the above scope but the tube is larger, like 30mm. Maybe that is because it is an illuminated scope--the crosshairs are red when the switch is turned on. Scope is new in the box. It has Talley QD rings on it but was never mounted on a rifle. It drew lots of attention at the gun show this weekend but no cash buyers (lots of trade offers). Anyway, It didn't go at $600 but there is a much larger show in Anchorage this coming weekend. PM if it sparks an interest.