This did have a different, traditional scope with different rings. The old rings were too low, the scope wouldn't mount without touching the base so he bought new ones. Those too (medium), were too low for the scope to clear the base. He went with "high" rings and was able to properly mount the scope. This scope is just big and takes up a lot of room in the front, these rings are significantly higher than the ones with the original scope. When he went to sight it in, he was shooting 12" high at 100 yards without any adjustment left to lower the POI. I inserted a small shim in the rear scope ring to bring the POI down and was able to bore sight it with a laser bore sight out to 60 yds with plenty of adjustment either way. Shimming the front sounds backwards to me, seems like that would raise it even more. Just my thought process.
I had thought of switching the rings front to back and didn't do it, I will try that tonight.
Again, I do not see anything wrong with the scope to this point, I will shoot it this weekend and see how it does. If it won't zero, I will contact them and see what they say.
The rule of thumb with iron sights is you move the rear sight in the direction you want the point of impact to move. It's the same way with the scope mount, but in this case you can't lower the rear of the scope to lower the point of impact, so you raise the front.
Look at the angles involved. When you raise the back of the scope, the front end of the scope points down but, that raises the muzzle relative to the scope making the gun shoot even higher.
If the little rectangles are the scope and the big rectangle is the gun barrel this is what happens when you move the scope.