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I can see how that would work fine in a OBG (one barrel gun). However, I doubt it would regulate in any of my S x S .410s.

Works just fine in my Citori Feather XS 30" O/U mod/full. Also in my Win 101 O/U 26" IC/Mod, and in my obscure Spanish SxS 28", about IC/Mod. And in my Rem 1100 26" Mod, and in my other Win 42 26" Mod. Have not tried it yet in my Uggie Aspen 28" with tight IC/Mod. I like .410s.