Haven't played since new patch - can't hit anything!

What the hell gives? People in game told me to not use attachments anymore (and seems to be verified by multiple people), but it hasn’t changed the fact that I am having a very difficult time hitting people. I have nearly 500 hours in game and would typically go at least 2 for KDR (but always PTFO!), but am finding myself barely able to break even after playing for about an hour just now.

Did I miss something?

You just have to relearn your weapon. Spring patch made huge changes balancing most weapons (only shotguns are imbalanced now). Almost every weapon changed.

https://youtu.be/iywLOUZlKdY

This guy explains things pretty well.

Hah I’ve been out of the game since last summer! Haven’t turned on pc in a year, cleaned it out of dust and started up with my trusty gtx 670 and 3570k@3.4. CPU going at 100% Gpu as well.
what kind of update made my system unplayable??