A pocket sized crossbow that fires a simple bolt. it uses a simple "hammer" mechanism that operates when a pin is pulled, releasing the "hammer" that hits the end of the bolt, launching it forward...
it travels about 15 feet(5m). i didn't use a lego rubber band. Sue me.
About this creation
below is the mechanism, you push the bottom beam forward, put the pin in, and then to fire it you pull the pin out
not my most color coordinated creation, i know, but pretty good for being made from spare parts!