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My bad. I thought you wanted it for slugs although you didn’t say that. Since you are going to limit your range using shot, a red dot should do fine. I would still go to the range, test fire several shots, find the center of the pattern, adjust the red dot to that center, then test how taking off the barrel and replacing it will affect the point of impact relative to your point of aim. I’d do this several times so you get a feel for it. If you’re always within a couple of inches at say 25 yards then I’d feel fairly confident in the system if you’re going to use it for self defense (or anything else). You may also want to repeat the test using several different brands of ammo and/or loads (2 ¾”, 3”, buffered vs. no buffered, etc.)
-UR
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