I can not help you very much other than add the newer 870's can be equiped with a large selection of various Rem-Chokes. There are also several other Mfgrs. who offer choke tubes for the 870. It almost seems like the choices are endless.
I suspect other gun makers do the same. My Winchester Model 1200 was equipped with the Win-Chokes, and I bought it back in the 1970's. Others may also agree and recommend a screw-in type choke capable barrel.
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