Your wish is my command.
http://smg.photobucket.com/user/Airsniper/media/Airgun%20bits/BSFandHWscoperail-1.jpg.html?filters[user]=1811841&filters[recent]=1&sort=1&o=0
While I do agree that the BSF scope rail and HW85 rails are NOT interchangeable as the '85 has two fixing screws and is 'key holed' at the front and the BSF has one fixing screw. I think the BSF rail is key holed at the back (Im not prepared to strip one at the moment ) so while they are not interchangeable the basic casting look very similar.
http://smg.photobucket.com/user/Airsniper/media/HW85withoutscoperail.jpg.html?filters[user]=1811841&filters[recent]=1&sort=1&o=1 HW85 without scope rail.
http://smg.photobucket.com/user/Airsniper/media/HW85scoperail.jpg.html?filters[user]=1811841&filters[recent]=1&sort=1&o=2 HW85 with scope rail.
HTH
Ian