Go multicolour firing with your airsoft gun as the new Acetech BiFrost tracer unit allows you that. This tracer unit has 11 modes such as: 7 X Mono color, RGB multilayer, Bifrost, Dynamic, and Demo and can be used with standard BBs, Green tracer BBs as well as Gel BBs for Gel Blasters. It also has a Smart Power Saving System: Shake and Wake for quicker kick-off. Jonathan Higgs takes a look at this muzzle device in this Airsoftology review.