Geonox Airsoft checks out the Acetech Bifrost tracer unit if it is indeed the best airsoft tracer unit for the year... "In this video we take a look at the Acetech Bifrost. In addition to the conventional tracer function, you can set the tracer to any color of the rainbow. You can also set it to RGB. In this mode, you see a beam that is red at the front, green in the middle, and blue at the back. You can even set it to a rainbow mode. The tracer shows a ray on which all the colors of the rainbow can be seen at the same time."