..looking to fit my Mossberg Classic 12 ga & Mossberg Field 20 ga with the above chokes. There are plenty of choices out there & no shortage of opinions on what's good vs what's a waste of $. Flush? Extended? Ported? Plus, I don't always "get" the manufacturer's product Description. For ex: Carlson advertises their LM Whitewing Dove ported extended tube version perfect for dove shooting. Then they have a simpler model in LM advertised for Sporting Clays. Heck, I'd think a LM pattern would be a LM pattern no matter what & just as good for one sport as it would be for another. Anyway, it's a bit confusing. I think a flush fit for the 12 would be preferred simply because its bbl is 28" & I really don't want to add more length. But I figure if I chose I could go extended on the 20 since it has a shorter 26" tube.