See posts on here of guys using the Primos jellyhead choke in 665"
The Primos website only lists the 660" as available for the Remington 870...where can you get a 665"? Did they use to be available in 665" and now only in 660?
I believe Primos only makes the .660 now, which is called the Jellyhead Max. The originals came in .660 and .665. Should be able to locate a used one on this site.