For example, using an AK47, it will shoot 2 shots, then stop. How does it work? Well if using any weapon besides a sniper or shotgun, (anything that is not semi automatic) I simply press a button on the mouse and it will shoot 2-3 bullets, (depending on the weapon) every time, the same.
I only noticed this, when in a private game with my friends, I started testing out all the extra buttons on the mouse, and came to realise that this might actually be able to get my account VAC banned. So I just got shipped my new pc, and it came with a 'New! CyberpowerPC Standard 4000 DPI with Weight System Optical Gaming Mouse' and if any of you have ever used it, you may be familiar with the button on the left side of the mouse that seems to give you a '3 round burst' in-game.
