Well Ihave to disagree on the 7 10 inch thing. Way back when I had a Weaver Quick Point in a sidesaddle mount. On a variety of shotguns with Foster slugs it would easily shoot under 3 inches at 75 yds. But they were all open choked guns. In fact had a Marlin 120 with a smooth bore slug bbl that stayed under 2 1/2 inches with ne of those Quickpoints. Heck IIRC they were the only red dot sights out there for a while. Didn't work in the dark though.