[Austin W Hogan]

The tip of the fore end has a large screw head showing in the photo, indicating that the proper extended fore end iron or loup was installed at the time the BTFE was fitted. This required heating the barrel asembly, removing the old piece and soldering in the new. It was apparently not a difficult job if the proper jigs were available. There are many early guns around with BTFE and/or ejectors retrofitted. I will post a picture of the part when I have a chance.
The info about Runge is from an article by Remington's last master engraver in the Remington Society newsletter a few years ago.

Best, Austin