I think Triple Se7en is right on the mark. Maybe $400, but not much more.
A new gun, blue with camo stock goes for $500 , (check gun broker or other auction sites) why would I pay $450 for a used gun when I can get new for $50 More?

Now, I know you are going to bring up the scope and rings. First off, most folks will not consider a scope in the price when buying a used gun. The rings are only 30 bucks or so, that scope is probably 60 bucks or so, new. Really doesn't add any value to the package.

I think your best bet is to take the scope off the gun and sell the gun and rings for $400 or so.
R
Hank