OK, that's too low, unless he's selling to me!
Seriously tho, you need to sell just the gun w/ no tank or hopper. Some people don't even want the barrel...they just want a good deal.
Having an 86 on the S6 is not ideal for a lot of people because the grip snugs the gun to your face, but the full body and beavertail are in the way.
You'd sell it pretty quick if you list at $495 and sell for $475 shipped, I'd say...new is $600 plus tax and ship.