Given the limited ammo capacity in airsoft gas magazines, airsoft players will need to watch their rounds fired or they will run out quickly. One way of avoiding it or slowing it down is to fire on semi-auto mod though sometimes you will accidentally move the switch to full auto. Nugentgl shows how to avoid it by modifying a GHK M4 Gas Blowback Rifle to fire in semi-auto only... "If you need to lock your GHK M4 to semi-auto only, then give this a watch..."