We have covered various awesome projects by LaserGadgets on this site in the past (such as the Iron Man Laser Gauntlet and LaserWatch). The latest video shows you how to create your own laser-sighted mini pistol crossbow. You are going to need simple tools such as scissors, pliers, a metal saw, and a drill to get started.
The above video shows step by step instructions on how to create your own pistol crossbow with laser sight. You can find the list of materials and tools on Instructables.com.