Good old wiki
is a start.
While the air soft guns may look authentic, the barrels are not rifled, and they have little in the way of accuracy at any range. Sometimes used for training or target practice, they won't move a knockdown or sihlouette, maybe even bounding off card targets. They shoot 6mm plastic pellets, do you want them littering your field? Riccochet off hard objects is common, so everyone will need eyewear.
Not sure they are really right for the target shooting associated with rifled air arms. The groups I know get all dressed up, rush out into a forest or arena, and try to shoot each other. A bit like paintball really.