Anyone know what the missing bits on this express sight are supposed to look like? I think it's an elevator of some kind.

Ladder sight is missing. Looks British...do not quite know what type of rifle you are working on. Quite often you will see Lee Metford sights on eBay...the ladder assembly from one of these shoud complete your project.

It's a 404 Jeffery built on a Mauser action, with English proofs. I also need a finish reamer because the chamber seems to have some pitting. I plan to remove the sights, set the bbl back (it's 28" long!), shorten bbl and recrown and then refinish. I am hoping someone can email me a photo of the same sight in complete and correct form.