FROM NOW ON I WILL NOT BE REPLYING TO QUESTIONS THAT HAVE ALREADY ANSWERED BY THE VIDEO OR THE WRITING BELOW, EXCEPT TO SAY "READ THE TOPIC AND WATCH THE VIDEO"

UPDATE: The concept behind The Logic Bow (put simply so everyone can understand)
By using a ratchet system to hold the bands behind the pin you can:
@ Decrease pin friction in barrel
@ Increase pullback distance
@ Increase power
@ Make the pin easier to pullback
@ Have a simple rail system

I have now uploaded a clip of the firing system in action for those of you who don't understand how it works

UPDATE: HOW IT WORKS
This is a pin type gun, not a slingshot. It uses a ratchet system to hold the rubber bands, therefore increasing the amount of bands that can be used and increasing ease of pullback. These bands are released when the trigger is pulled, propelling the pin into the bullet. This means that the effective pullback distance is increased, therefore increasing the range and power.

well here is the first "new thing" I have done in ages, (the last Truly innovative thing I built was the D-Frag grenade) the Logic Bow. It uses an all new 4-stage firing system that runs between two rails (I tried using a dual rail system but that didn't work out). So far I have the mech working, but it needs the rest of the body, the bow, a handle and probably a stock. It is a single shot that should have more power than a pin gun, the really cool thing about it is that although it uses a pin mech the pin takes almost no effort to slide back.

I will keep you updated as the project progresses, Feel free to ask any questions.

Update: I finished the entire gun and uploaded a couple of pics (see below)

This will soon be posted.