I believe It's the Choke Configuration Steve. Rem Choke 2. I would ask Remington for verification at Remington Customer Service TEL: 1-800-243-9700

My experts came through RC2 Refers to Remchoke choke tube #2 which is a rem choke modified constriction It means that the gun only comes with a Mod choke tube instead of with a full set of rem chokes

I have posted the question to some Remington experts and am waiting a reply

to be honest I cant find anything Remington does not list a rem choke 2 choke tube in their shop only remchoke s and pro bore chokes I am still checking but as of now I suggest that you call Remington at Remington Customer Service TEL: 1-800-243-9700

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Hi Steve it is the Rem Choke 2 it reliably cycles 2/75 as well as 3 inch magnum shotshells interchangeably