$300, delivered, isn't a screaming deal on a used adjustable sighted blued ROA. Not bad, but not the deal of the year. It would have been a pretty sweet deal on a fixed sight version though.
I have a few of these myself. There's a tenth one I picked up last year that isn't in the picture, a NEW, without box, 7 1/2" fixed sight blued model that I picked up from gunbroker for $330 + $20 shipping.