Go Black Red, or go with Green Gas Airsoft Guns that is! Unlike CO2 green gas airsoft pistols are auto/semi auto and can fire multiple BBs at once without cocking or reloading. Green gas airsoft guns are generally faster and easier to reload than their CO2 counterparts. This makes it perfect for airsoft battles. Most gas airsoft guns tend to be powered by green gas now-a-days as well. Giving you many choices and models to choose from.