In this video tutorial, viewers learn how to make a 20mW green laser Air soft gun sight. The battery of the laser goes in the positive side, facing the tail cap. The switch can be put anywhere on the gun where it is most comfortable for you. The laser should come with an Allen wrench for quickly mounting it to the gun. Fine adjustments when sighting in are controlled by a knob for distance and a knob for elevation. To aim, just power up the laser and point it at the target. This video will benefit those viewers who have an air soft gun, and would like to learn how to modify their gun by adding a laser sight for more accuracy and aim.