This mod fixes the issue with the China Puff GL where the trigger for the pump being pushed forward is incorrectly typo'd as "pull" during the recoil animation. Basically, instead of going k'chunk k'chunk it goes k'chunk k'chck.
Video:
The video does use my soundpack, but you get the idea of what it does
All credit goes to Cpone for actually making this fix. I'm just uploading it.