Leszek in the video presents the Acetech Bifrost Tracer Unit system which they say is the airsoft tracer unit for the 21st Century... "In our latest video on YouTube, we present the Tracer Bifrost - a breakthrough piece of equipment for ASG shooting enthusiasts. Made of extremely durable aluminum and the highest quality plastic, this sound suppressor is a real gem. Reaching an impressive exposure speed of up to 35 balls per second and providing as many as 30,000 exposures per full charge, the Tracer Bifrost is not only reliable, but also effective. But that's not all! The Bifrost module offers as many as eight different flame imitation colors, which allows for almost unlimited personalization possibilities. Even standard white balls turn into a fascinating light show. It is also an ideal way to achieve the effect of shooting a rainbow stream."