in paintball the rule is if it doesn't break you aren't out ( on my field, if you're hit in the back no matter what you're out )
trust
there are some buttheads in airsoft that keep going, but usually everyone calls themselves out if they're hit
just like in paintball where there are the 12 year old buttheads that fall back a few feet into the bushes and wipe ( i usually close within a distance where they can't, because i can clearly see them and i usually shout "YOU'RE OUT!" really corny-like )
airsoft if incredibly fun, and there are some cheap chinese-clones that offer a very good value for the price, although the name-brand guns will last a lot longer ( higher quality, last for years if not abused )
I've had my cm028s for a year now still functions perfectly