BT Thank you for posting this Now I know what I have.. I have an SS Encore rifle barrel that has dual dove tail grooves to close together to make sense, the groove at the chamber end has been filled and then drilled and taped for a regular rifle encore forend screw as well as the usual forward screw, I have puzzled over this for 25 years, I think I even have the proper forend hard ware for it SOMEWHERE ????? hope I did not get rid of it. Thank you thank you