In Fallout 3 WMK, you could remove them because it was scripted, but when I investigated FNV with the GECK I saw, to my dismay, that there was almost no way. I can't think of a way to do so.
I know you can sell the weapon and get it back without mods, but that's just lame.
I was thinking of making text files that would take the modded weapon away, then give you a fresh one with all the mods available for it. Then, add the weapon mods you want and run a different text file that gets rid of the spare mods.
But that would take a long time to do. So, I'm hoping someone can think of a way to remove them with a mod...
