I'm new in the forum and this is my first post (sorry for my bad english). I realy like the slingshot crossbows because they are very cool, and some of them remind me an old firearm (muskets and flintlock pistols) just like 18th century weapons.Some of them have multiple shots. The only thing I can think that missing is a semi automatic action for pistol crossbows and full automatic mechanism for bigger crossbows (like repeating crossbows). I think it would be very fun to have such a thing. So my question is that is it possible to make full auto crossbow just like "Van Helsing" crossbow, or Gretel's crossbow from the movie "The Witch Hunters"? If it is, I will be happy to hear your suggestions. If not, than I will gladly hear alternative suggestions. It will also be amazing if someone will build such a thing and show it in youtube.