Scrapnel would probably be the best bet on here for real worth.
Myself I've been watching Vixens for over a year now, specifically .222's.
My .02 cents on yours 750-850.00 it would sell pretty quick. Most are asking 900-1100.00 and some bring that, but they seem to sit around for a long time. I don't know really a thing about the different variations and what's more desirable. I just want a nice one that I can also go shoot.
Don't think the scope really adds anything to yours, and they don't look like original rings either?
ps: I'll give you 501.00