Ok cool. so its pretty much shunned upon. I'll keep that in mind.
Don't TRY for headshots if you're given any other shot.
They do happen though. Don't NOT take a shot because you only have a headshot... just don't go full auto on their ear from 3 feet away.
For example: I played a game today. Shot at a guy about 250 feet away (I was trying to scare him out of cover, not just hit him).
I hit him in the lip... I think he peed himself a little. I know he threw his gun a little and stumbled a bit and almost fell over (Probably helped that I was far enough away that he didn't hear that single shot being taken). Accidents happen.
Another example from today (because I like to brag): 80 feet, guy popping his head out from a tree with a gun. Tree, gun, head. It's all I can see. I shot him through his red-dot. (Yes, like enemy at the gates... THROUGH the sight, into his nose, clean hit). It was the shot I had, I took it.