It doesn't have a trigger like the other ones because i found out that you can't use the full power of the crossbow then.
It uses the wheels to spread the power across the rubber bands to make it shoot further.
I recently joined and therefore this is my first Instructable and i've tried to make it as detailed as possible.(I'm trying to make a new trigger very soon)
Finally after like 2 years I made a proper trigger xD. It is buildable from the pictures in this topic:
Step 1: Pieces List.
Step 2: Building the Handle.
Pic 2: Put the blue rods in between every gap.
Step 3: Building the Bow.
Pic 2: Build these top pieces.
Pic 3: Add the rods to the bottom pieces.
Pic 4: The same as pic 3.
Pic 5: These are the top pieces upside down with the yellow rods, just add yellow rods.
Pic 6: Combine the top and bottom ones just like on the pic.(Don't connect the yellow rods to the bottom pieces, just leave em.
Pic 7: Add the 4 red rods.
Pic 8: Add the 4 red connectors.
Pic 9: Add the pieces.
Pic10: Add this.(Don't forget the dark grey connectors at the back and the orange ones with black clips.)
Step 4: Adding the Handle to the Bow.
Step 5: Adding the Rest of the Bow.
Pic 2: Add the extra rods.
Pic 3: Do this on both sides.
Step 6: Adding the Rubberbands
Pic 2: And so forth.
Pic 3: You the 5 rubberbands to be like this.
Pic 4: Get the red connector off it and put the first of the chain rubberbands around it.
Pic 5: Go all the way around and do the same thing on the other side, then put the rubberbands over the wheels.
Now you're ready to load!
Step 7: Loading the Arrows.
Pic 2: Load it like this.
Just pull it all the way back and shoot.
(Don't shoot any siblings with this...)
If you want to keep your red connectors don't fire straight into a wall.
(See Pic 3...)