The seller is in the business of reclaiming old barn wood,says he found it in a barn.He cleaned it up and in doing so all the finish was removed,but says he shot the gun multiple times with no problem.What's the backstory?
If it's fire-damaged, I wouldn't pay more than $75 - maybe $100 - unless the stocks looked original (indicating that the fire didn't get hot enough, for long enough, to damage the receiver). In that case, it'd be well worth $150.
However, that receiver really looks like it was blood-damaged, to me. If so, there could also be some serious pitting and corrosion inside the action. So, it could turn into a parts rifle, if the internals are eaten up.