FUSION™ Folding Front Sight | BlackFUSION is a series of modular weapon mount components that provide users a configurable solution for placing accessories such as lights and lasers. The system was originally developed as a means to help put weapon accessories in in more advantageous positions when rail space was at a premium. It allows integration of industry leading accessories from companies such as Surefire, Modlite Systems, Cloud Defense, Streamlight, and Steiner Optics. FUSION