Video from Laylax showing you how to install the Nineball Fibre Optic Sight for the Tokyo Marui Hi-Capa 5.1 GBB Pistol. Installing this gives you a sight on your pistol that allows you faster target acquisition in low light conditions. Both the front and rear sights show a green colour of condensing acrylic and the base material is made of high-strength geralumin.