Not sure if the fibre optics installed on your airsoft gun for sighting is real or not? Wong Davy of MIT Airsoft (MITA) posted a video to help you differentiate the fake one from the real thing... "This video will teach you how to differentiate the real fiber optic from the fake one. Check this out!"

New Fibre Optic Trinity Front Sight from CowCow Technology is now available for Tokyo Marui Hi-Capa Gas Blowback Pistol owners... "CowCow Technology developed a new front sight for TM Hi-Capa. Called the Fibre Optic Trinity Hi-Capa Front Sight, it is fully CNC machined aircraft graded aluminum material. A 2mm real fiber optic was selected and 2 colours options (Green and Red).