Im not sure the haters totally have their heads wrapped around this gun as built. Then again, They may not appreciate a gun thats been tweaked.
I just built this gun on paper per your specs and im at $837 not including shipping. So at least on paper, your guy isnt blatantly ripping you off.
My original statement of "if you and he both want the other's toy more than your own, go for it. "still stands.
Im not saying its a bad gun, if he has 837 in it, and best case scenerio a used gun lose's 10% if its factory, and 20% if its custom your looking at 669. You dont get your money back on custom parts because mabye the next guy wanted a diffrent stock, scope, barrel, etc