Hey guys. I have a 700 .308 that I purchased second hand. It has a Leupold Mark4 6.5-20-56 Mil dot with 1/4 moa adj. The person that sold me the rifle used the standard Leupold rings and two piece base and I want to upgrade to the Mark4 rings and an EGW one piece base. My question is, I don't know if I need the 1" or the 30mm rings. I have the box that the scope came in but there is no indication as to what the tube size is. Thanks in advance!