You don't need to get a new gear box to get the higher FPS for outdoor play. Just upgrade a few things ie. spring, etc. If your worried about your V2 gearbox breaking from the heavier spring then upgrade it with this....
http://www.tacticalairsoftsupply.com...er-system.html. Guess it also depends on the kind of gearbox you already have in there to begin with. If it's not reinforced or has smaller bearings (like 6mm) it might be worth it. I'm just new to AEGs so that's all I've figured out so far. Might want to wait for some more experienced advice....