[i'm trying to get 500 for it... think i could swing that?]
While there's sometime a butt for every chair, I'd never go that much dinero for a M77RL in that condition (although the pics could be deceiving regarding condition) - since IMHO that particular scope is a giveaway/discount.
bottom line: You won't know, until you try.
Put in the Classifieds, here - you can always reduce your price if it draws little interest at that price level.
.