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Is the receiver tapped for a scope Mount?
I also have had poor luck with clamp on rib type shotgun sights, and better results with upgrading the bead sight. The rib is your rear sight, the bead should appear to float flat and dead center on it with none of the top surface part of rib visible if eye and head are in proper position. Hope that helps. Would a person clamp sights on a revolver and then shoot at a living thing? But thousands of those sights have been sold year after year, regardless. Best of luck on a gobbler!
Those Truglo fiber optic sights used to be awesome, but it seems the production quality has suffered as of late. I tried several different models of them including the clamp on, magnetic, and stick on. None of them would stay on the rib of my gun. (Even with sights that supposedly were the right size for the rib) You could just go with the stock bead like some have mentioned. But some shotguns have a point of aim vs point of impact (POA/POI) discrepancy. Point in case, I have been using a Stoeger M3500 for the last several years and just used the stock bead. I like the gun, but I've had a lot of frustrating misses on turkeys over the last few years. After research I found that the Stoegers often have a significant POA/POI difference. With the Truglo sights not staying on, I think my next course of action is to go with a red dot sight.