Originally Posted by The Saint
Actually, 7.2v has been demonstrated to work quite well in moderate fps guns, providing that the 7.2v has a favorable discharge rating (ie. most sub-c cells with high mah, or LiPo).
This is true.
I'll rephrase.. most
7.2v won't work to well. Depends on the battery and your setup.
On the up side, batteries designed for R/C are usually made out of cells that can handle a high discharge rate... at least the good ones are anyway.