Gauging Interest: Sun Projects XM-177E2 Carbine/M16a1

[Dust2Dust]

Sun Project's M16a1 Carbine with the following upgrades:

3rd Oring (consistency upgrade)
Steel screw (allows for higher pressure)
Custom bolt (allows for even higher pressure)
Adjustable hopup (durrr)
brazed valve (ensures stability in the output)
and supposedly a tightbore barrel.  I cannot confirm or deny that.

Gun cycles properly and well at 150PSI

I'd like to see what people would offer before I decide to sell this, as I am broke as shit.  No bullshit here either, if you say anything less than $600 I will ignore you.  I'm NOT looking for trades, I'm leaving airsoft, probably for good.  So figure it out, I don't want another damn gun.

Pictures:







here's some internal shots:
http://i23.photobucket.com/albums/b369/Dus...SP/DSC02918.jpg
http://i23.photobucket.com/albums/b369/Dus...SP/DSC02920.jpg
http://i23.photobucket.com/albums/b369/Dus...SP/DSC02921.jpg