Power test commercial crossbow: http://www.youtube.com/watch?v=td-uQmuiwds
This is my new rubber powered pistol crossbow I made out of solid beech (10€ total).
Rubber: Thera Tube Blue ebay
Darts/bolts/arrows: commercially made.
It deliveres a muzzle energy of 13 joules which is double the energy of pellet guns legal in Germany. The tutorial shows you step by step how I constructed this small but powerful shooter. Length: 450mm
Music: Dan-O at http://danosongs.com