I would pass. You could buy a new one for that much that isn't somebody's frankenrifle with mystery parts and possibly assembled improperly.
You could also buy individual parts and assemble it yourself that way you get to pick and choose each component. I'm assuming you don't have the tools to assemble one so that would be an added expense. Though, if you plan to do a lot of shooting you will need those tools anyway for maintenance and repair purposes.