I don't have any experience with this particular gun, Echo1 tends to get decent reviews but they are definitely not the best out there. You should get out and play a few games before you start modding in my opinion, get a feel for the gun and the game so that you better understand what would help you most.
As for Age Verification look at this thread:
http://www.airsoftcanada.com/showthread.php?t=77601