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Grant, the Marine model uses Beretta/Benelli Chokes. I assume the same but would contact TriStar Customer Service to confirm : https://www.tristararms.com/faqs/
I just watched 3 YouTube videos on this shotgun, never a mention of the chokes/system. As James said you can try to contact Tristar, but honestly with these smaller companies it can be difficult to get a reply, they don't have the same customer service as the bigger companies, I emailed Century arms on Friday with a question and still haven't heard back, Glock, Ruger, SW, and all the other big companies usually reply within a day.
this is the Cobra III Tactical and it comes with 1 cyl beretta mobli choke tube https://www.tristararms.com/series/cobra-iii-tactical/
Grant, chokes are changeable, but it only comes with 1 cylinder bore choke tube.