Ok usually when you shoot you hold down the mouse button.
I used to do that, but now i click very rapidly on my mouse.
AND IT WORKS (for me) ((results may vary))
When you hold the mouse button the recoil always go really crazy.
Lets use the g36e as an example, when you scope and shoot the crosshair goes all crazy like.
For me, when i click it usually stays in the same spot and i hit my target more often.
The same holds true without scoping.
I usually kill more people by clicking, not holding.
Test it out!