Originally Posted by ballzman
Bolt: new bolts arent that necessary
Barrel: CP one piece .685
Hopper: used Reloader B
Electronic upgrade: the CAMD eframes are nicer than the old LED ones. either way if you get one of those and not the new style you may need a new rechargeable battery.
Trigger: it's personal preference but any with a bearing will be good
And any other ideas you might have: a newer body so you can put a clamping feedneck on it. you can find used ones pretty cheap. oh and uprgade to HPA. Also, a spring kit, high flow valve, regulator
I'd go barrel, loader, HPA, body w/feedneck, eframe, then whatever