M4A1 is beast.
I pwn umpers with it. It is my sexy.
Lol... I usually get around 15-30 headshots while sniping in a match.
And in CQC I'll usually aim for the head and headshot them then too. I get called a "lucky noob" and an "aimbotter" a lot. ;D
M24 FTW.
Btw, the FAMAS and M4A1 seem to like to randomly headshot people out of nowhere. So yeah. You can spray at people from long range while scoping with the FAMAS, and it actually hits like 70% of the time. And the M4A1 has no recoil anyway, so you can spray and in 3 seconds you'll get a headshot rofl.