The fire effect on AK47, TMP, and Deagle has a bug ( its not disappearing when switching to other weapon or knife )
to remove those firing effect:
just go to the materials folder and delete these folders ( /particle/fire_burning_character )
CSO2 Mod Pack
https://drive.google.com/file/d/1PUo5-LBBS7EdAEdZ-XS5SPtKcvW2GBn8/view?usp=sharing
ctto.