How it works:
The big block trigger on wheels is pulled back to the back of the gun where it is locked in place by the main trigger. Then the firing pin is pulled back on the block trigger and the block trigger's trigger is locked in place. When the main trigger is pulled, the block trigger is pulled to the front of the gun by the rubber bands connected to the crossbow arm and then the block trigger's trigger is pushed out of the way by the green connector on the side of the gun and the block trigger shoots. This gives the bullet, which is in the block trigger, two times the momentum of a regular gun, thus maximizing ranges.


























![Dash [Knex Slingshot]](http://www.instructables.com/files/deriv/FZV/DRUE/GCZAQJKN/FZVDRUEGCZAQJKN.SQUARE.jpg)







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Apart from knexguy's comment, I would like to add that in fiction (mainly in computer games) , many railguns are automatic (not all of them are), but in real life, railguns are huge complex machines that take ages to reload.
They could be quicker to reload but they are mainly being developed as naval artillery, so they fire huge rounds.
*Evil laugh*.