ShootingSightLLC modifies firearms in a different way than most. He adds LEDs inside the firearms to give them a futuristic look. He says the guns are 100% real and functional. However he does not know how well the electronics will fair with live fire. Kind of defeats the purpose if you ask me.
Here is a photo of a Beretta ARX-100.
However those are nothing compared to this tricked out IWI Tavor.
This reminds me of the modification people do to their Nerf Blasters.