1. There are legendary class mods that you can get from loot boxes. I picked up a Siren class mod on my level 50 Zer0
Legendary Siren Class Mod Cooldown reduction 37% Gun Damage 25% +5 Ward +5 Accelerate +5 Minds Eye +5 Flicker +5 Foresight Increases Movement Speed by 45% while using Phaselock
"[Giggles] I'm Really Good at This"
no joke guys tell me how to take a screen shot and I'll probably do it.
2. Loot continues to level past 50 based on your badass points. I'm not 100% on this but pretty sure. If you tip Moxxi enough to give you Good Touch at level 50 then get a couple more Badass tokens go back and get another it should be better than the previous gun. If you get 2 guns in a row without getting any badass points in between they have the same stats.