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I believe this page should help, it lists the Orion as using the Integral Multi Choke system and lists compatible choke manufacturers as well as a link to get them from Weatherby: https://weatherby.com/support/choke-tube-guide/

Greg, Factory-style Winchester/Weatherby/Mossberg choke tubes fit Winchester/Weatherby/Mossberg (except 835) shotguns with factory interchangeable chokes.