auto177Barra Airguns' 400e, the first production full-auto .177 BB gun powered entirely by electricity, eliminates the need for CO2 cartridges, delivering unmatched convenience and shootingThe Umarex StrikeForce gives you a full auto CO2 BB rifle desned to remind you of the familiar looks and operation of an SBR firearm. You'll enjoy speeds up to 450 fps for exciting