So, this kind of ticked me off.
I had a really nice Assault rifle I had gotten from a lock box. It did nice damage and vaporized enemies. One thing I didn't like about it was that it didn't have enough mod slots. I tried adding more, but sadly, was one of those weapons that wouldn't allow you to add more slots. So I though, ok, I guess I'll add a mod slot to my LMG which is only missing one slot. I add my LMG to the mod slot queue. It says for me to wait 10 minutes. I equip my Assault rifle and start a mission. The one where;
---Spoiler---
you, cooper, and the guy from the transit depot go to get the nova strike from the raiders.
---End spoiler---
Anyway, i get in to the mission and I realize I have my LMG equipped. I say to myself, "That's no right..." and check to see if maybe I added the AR by accident, even though it didn't work earlier. To my disbelief, the AR had just vanished. Not only that, but the LMG didn't have the mod slot added. And to rub salt in the wound, it won't let me add mod slots to the weapon even though there's one slot left.
So now, I'm missing one gun and the other one is bugged.


got a ticket going hoping they can get it back for me.

