I also did the exact thing MT shows above. Same scope but extra lo rings and I LIKE the Weaver 82 base for this. Its longer and allows he scope to be mounted farther forward. I just cut a new rear slot in the correct position. The Simmons 2.5 shotgun scope has more eye relief and is shote so its a perfect match for this set-up.
It works out so the rear most part of the scope is FLUSH with the breech of the barrel when opened!! Nice and lo, a very clean setup.
CW