Here is the list of upgrades. Prometheus purple bucking, with flat hop mod. 6.03 mad bull black inter barrel. Kwa Reinforced v3 gearbox Air nozzle with oring is stock She piston with full metal rack She pistol head Shs 12 to 1 gears Metal Ball bearing spring guide Titan gate mosfet Aftermarket cylinder head. Don’t remember the brand. It has very good shimming job. Willing to provide shooting video. What you see is what you get. Asking 400 shipped.