It is a stainless with roll pin. The sight blade is blued.
From picture in the link below, you can see that someone has modified it with a file to just a post at one end. I managed to hit it with a hammer and block of wood whilst slugging the barrel!
I may be trying conicals soon too. Do you really need a taller blade or will the rear sight adjust enough?
Mark
http://i8.photobucket.com/albums/a21...psbknixbml.jpg