This is the setup on the one I saw here. It has the notch and ramp ring like your 20's barrel on an 04 receiver. Looks to fit up Ok but noticed it has the wrong later forend wood which might explain how they got it to all to work from what your experiences above were.
Nope. I wasn’t even going to bid, but I couldn’t pass it up for $200. But other bidders wanted it more.