Thanks
iv already read your preavious post and im just trying to make shur i havent mised aney thing. Im going threw the age verification right now.
the last thing I want to do is piss aney one off

All you need to know about upgrades can be found in this thread;
http://www.airsoftcanada.com/showthread.php?t=2697
It explains internals, their purpose, and the result you get from upgrading them.