Cley Films demonstrates how to install Fiber Optic Sights to TM/WE/E&C Glock airsoft gas blowback pistols in this video. Some patience is required as the video is a bit blurry... "In this video I am going to demostrate how to replace the  stock sights of yout Tokyo Marui (TM) / WE Tech / East & Crane (E&C) Glock Airsoft Gas Blowback Pistol with Fiber Optic Sights.

Evike.com show the Fibre Optic inserts for sights from APS. These are 3" fibre optic insets thay can be cut to fit fibre optic sights to help you aim in low light conditions. The package contaisn 2x Red and 2x Green Fibre Optic Insert and will fit most fibre optic compatible iron sights.