This is one of the most basic weapon accessories, and it consists of a small glow rod that clamps onto the weapon, and activated by a squeeze switch. The problem with them is that your sight picture goes to hell unless you are using a red dot sight, laser sight or night sights. They can also be seen from much further away than t hey project a useful illuminating beam, usually out to about 25m. These are commonly found with Stormtroopers assigned to urban or subterranean areas. Due to their size, they can only be mounted on pistol sized and larger weapons.