Yes they can, i have made one, What you do is buy a small motor and some grips to attach to the cock. You hook the gears up to the motor, then the batterie and electric wire. Tape the wire to some plastic and attatch to trigger so when pulled it touches the end of the batterie. Then you hook up to cock and secure very tight so it won't budge. When you pull the trigger it wil connect to the batterie that will turn the moter that will pull the cock back and cock it then it will slip. It will do this repeatedly and your gun will keep shooting when cocked as long as you are holding the trigger all the way.
there are also semi auto springers out there (surprised?):
Tokyo Marui Gindan Glock 26 (G26) Semi Auto Spring Airsoft.
In airsoft guns, automatic electric gun. Battery powered airsoft, versus spring powered or gas powered.
all electric and gas ak 47 are automatic but spring ones arent
No, it is not. All spring powered guns need to be cocked for each shot.
no spring guns have to be manualy cocked every time. Only electric or gas can shoot automatic.
Airsoftmegastore.com
Automatic Electric Gun - i.e. airsoft toys guns.
No. Spring powered means spring powered. Not fully automatic.
Yes, a few. But they are low quality guns.
Yes
Never buy spring guns
Yes. There are Gas powered guns and spring powered guns.
Yes but there hurt