Karl, it has external adjustments on the outside of the rear rings. Seems to put pressure on the scope body to move it where you want to. I've seen a lot of scopes over the years but nothing like this. Right now feel like a kid at Christmas. Spent last two hours cleaning/waxing, some of it was drool.
My buddies in PA have a couple of the model 70's, I just migrated towards Remington over my early years.