This isnt directly related to the 2.2 patch, but its a bug anyway.
Gatling gun bug...
1) Set up a gutling gun and step away from it.
2) Line up so you could use it again.
3) Press fire AND use at the sametime.
a) if you pressed fire1, the gatling will start to shoot before you use it.
b) if you pressed fire2, the gatling will disassemble before your eyes.
I wanted to post this in the semi-private forum because when I was playing around, I was able to get a free gatling gun. I had the devmap loaded and god mode on. When I pressed fire2, another gatling gun appeared in my hands. I havent been able to reproduce it though.
If you're confused or cannot reproduce it, heres a demo of me playing around. No devmap, so this is acutal gameplay.