Cass has a hunting shotgun fully modded. ED-D carries around the AMR+ammo, the Pulse Gun+ammo and Grenade Rifle+ammo.

Went off to do some gambling at Gomorrah. After cashing in my winnings and leaving I set Cass to "Ranged" and noticed she switched to dynamite . No big deal I thought at the time. Fast forward 20 minutes and We're all out in the wasteland getting close to the BOS safe house and see deathclaws in the distance. Good time to pull the AMR from ED-E and have some fun. At this point it dawned on me that all the ranged weapons both followers where carrying where gone. They even kept Cass's caravan shotgun. I sure as hell didn't have the missing items.

Good thing I had a save right before entering Gomorrah, but bug or not it's a very bad idea to take followers into the strips Casinos I learned this day. So just don't do it and have them wait outside.

So that's where my Thump-Thump went. I was looking for it everywhere but I was sure that I didn't drop it. Those bastards! I was looking forward to using that thing as well.

Yeah the casinos are bugged. Right now I have Cass's Shotgun, Arcade's Ripper, and Veronica's Power Fist.

After replaying that a few times it gets worse. The script strips followers weapons even if they are left outside, or better yet as I tested leaving them in Novac. I have to fire my followers if I want to gamble at Gomorrah now.

Bethesda QA, best QA.....

EDIT: It's just Gomorrah that seems to have this silly bug. Ultra-Luex returned everything just fine. Tops I can't test in my current game because of the deal I made with Swank, but I still have the unique Gauss Rifle that was on Veronica at the time.