gunpilot,I used Leupold Dual Dovetail rings and bases on my M70. I cleaned the base screw holes in the reciever and the screws with lighter fluid and put red Loctite on the base screws. I'll have to use a propane torch to get the screws loose. I like the Dual Dovetail system since it eliminates a screw to come loose where the ring meets the base. Dave