My shotguns are all older models, so I can't help with interchangeable adjustable chokes. However I can vouch for the usefulness of adjustable chokes.
I have 2 old bolt action shotguns with factory adjustables. One is a Mossberg with a factory C-Lect choke. The other is a Kessler with a factory Komp-Choke ( compensater\choke combo). You can,with a simple twist, switch from tight patterns for turkey over to wide open for slugs or a round of skeet. I would start by checking your LGS or a gunsmith to see what they can recomend. They may have an older Poly-Choke that they can install for you, or a barel that has one on it that will fit your shotgun. Hope this helps.
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