Right so I found this yesterday when I was modding my Righteous Authority version. I don't have a picture of it just now but I can get one. It's a scope mod called "Long Scope X+". I am able to attach it to another laser rifle and it doesn't take any materials to build. Is this some sort of reward mod?

Anyone know about this or seen it in-game?

Heard about X+ mods from other people but I've never seen one myself.

I believe that it is bought from Proctor Teagan on the Prydwen. Not sure if there are other ways to obtain it. I can't remember if i came across any other "X" mods but if there are more i'd like to know. I should say i'd like to know if there are special unique mods to find not where they are i want to find them myself.