It can shoot semi-auto but if you don't let go of the trigger fast enough it shoots all the rubberbands at once.
About this creation
The spindle spins until the white technic piece stops it.
The white technic piece doesn't stop unless you let go of the trigger. It allows for more time to let go and if I load the rubber bands three spins apart then it will shoot semi-auto, but I almost always accidentally shoot two at a time.
This shot is so you can tell the actual size of the gun.
The next gun I make will be semi-auto. I'm going to use one of Bohdans designs.