I would disagree!
That looks like an 80% pistol at best with an after market magazine and is only worth about $600 top. It will cost you up to $100 for the proper magazine, depending on how lucky you are.
I personally would not give more than $500 for it IF I was going to buy it! But then I almost never buy anything that is not closer to 95+% unless it is something on the unusual/rare side.
Sarge