OWD

Re the Screw, some Rigby's had a slective Ejector / Extractor mechanism
actioned by a screw but I can't remember where the screw is located.
I do agree that the Ejector would fall out without the screw as shown in the Picture.

I don't mind a reblue / refinish as long as it has been done well.

Toplever Right of Centre - could be tighten - if it has been rebarreled
it would need to have been done but also, the RB RTB mechanism
can "catch" abit.

I would prefer an inspection.

500 Nitro