Replacing scope on a Wby 300 Mag I acquired and puzzled by the way the rings are attached to the one piece base. The front ring is held in place by two screws after the base of the ring is inserted. But the rear ring is sitting on top of the base and seems to be held on only by a large screw on each side which slightly overlap the base. Is that enough to hold the scope in place? Please see the photos. Notice the marks on the base of the rear ring. Please advise if this is OK or what I should do next. Thanks for your help.