Airsoft guns projects 6mm plastic bbs. Airsoft is designed for use in a certified or regulated sporting event or competition, in military or civil defense activities. Airsoft Guns Types: Spring guns:  manual powered Airsoft guns where you fire each round by pulling the bolt into the locking position, Gas guns: powered by CO2 cartridge, propane adapter or green gas, Airsoft electric guns : Known as AEGs, are battery powered, designed for easy troubleshooting, high power and high rate of fire.