I have long thought the tried and true sling shot is a great addition to any survival kit. It is quiet, powerful for its size, and you can pick up just about any rock to use as ammunition. It is a great way to get small game for food in a survival situation.
While watching an episode of Apoaclypse 101 on NatGeo I saw a guy who had moddified his sling shot to fire arrows. After toying around with the arrow rest I had seen on the show I decided that there had to be a better, more stable way of holding the arrow while lining up for your shot. The following Instructable is what I came up with.