OK, I just did some more looking. They don't even offer a 10 gauge rifled barrel. I thought they did. However when you look at the 10 guage barrel listing the the 12 guage heavy barrel is listed there. And it says nothing about coming with or needing a special forend, so the 10 gauge forend must fit it.

The 20 gauge heavy barrel has a note that it comes with the special forend that that barrel only takes. That leads me to believe that it is not a 12 guage blank, but maybe some completely different design or something. It's odd they list it being on either reciever though. I wonder if it was a miss print or something.

Paul