welcome to ASC!! when gettin hit with a bb they use the hounor system its more of a trust thing. If people don't call there hits a ref nearby may notice and take charge.
some games that involve real ammo (actual ammount for a gun in ur clip) so that means realoading after 30 bbs depending on your gun. once again trust is an issue one this as anyone can cheat but its not as fun when there realoading properly and ur still shooting 100 bbs.
try and go to a game near you and watch and see how they play the game it might be pretty fun (hell it prob is)