The Holograpic Sight is an attachment in Islands of Nyne that can be used to modify your weapons for additional bonuses.
The Holographic Sight (Holo sight) is a sight that projects it's reticle center optic, presented as a circle with a central dot. It provides slightly better magnification than it's sister competition, the Red Dot Sight. Due to the design of this sight, it can be fairly obstructive to your peripheral vision, as the housing is large, but nonetheless, a very usable optic that gives you a slight boost to your magnification at the expense of a slight loss in vision. Every weapon class except pistols can use the Holographic Sight. The Holographic Sight is modelled after the EOTech XPS2, albeit with a red reticle as opposed to green.