Alright, thank you for all the information so far. So I suppose I should severely reduce my FPS goal for this, maybe around 330-350 at most. Anything that gets me just a little more power but doesn't wreck the gun without more upgrades. So would an m100 spring be what I need for this? Or would even that put significant more strain on it and be cause for further upgrades?
As for a battery, I guess a 7.4V LiPo is what I should be after? It's looking like I would have to buy online, there isn't much for airsoft gear around here, so where might be the best place to obtain one of these and a good charger for it?
Thanks again for the replies so far.