I learn you top make a very powerful crossbow. let's do it!
Step 1: The Body
make the body of Lego bricks with nops. make him very long how longer, how more powerful
Step 2: The Trigger
see the picture's for a tutorial for the trigger
Step 3: The Bow
make the bow of 2 parts that can rotary and maker it strong with rubberbands. than you make the rope of 2 rubberbands
Step 4: The Scope
make a scope of bricks of a plane moter of Lego and some whees.
Step 5: Loading With Ammo
take some long pieces and take the role rope of the bow under the trigger and take the brick for the trigger
Step 6: Shoot!
now you can shoot!
Step 7: On the End of This Instructables
thanks for reading this arcticle. I hope you makes it. sorry for my English, it's not so good. see you later!