So there has been a "fast shooting" glitch where you'd change between 1st and 3rd person mode.But luckily it was removed because it was OP and many people used it.
Now there is a new "fast shooting" glitch.Now you can do it by changing secondary and primary weapons fast.
Example: You have a pistol.You shot with pistol and you switched to sniper very fast which will shoot 2 bullets.
This must be removed quickly or it will become popular and many people will use it.