on bf4stats you can see that this player has 95 kills on the g36c and 44 of these are headshots which is literally impossible.

http://bf4stats.com/pc/Junkylystla/

on Istats it shows 90% kill/hit on some snipers and 80% of this is headshots you must have insane aim for this

https://i-stats.net/index.php?action=pcheck&player=Junkylystla&game=BF4&sub=Check+Player

~wilde

http://battlelog.battlefield.com/bf4/battlereport/show/1/812647443404945472/1543800280/

Looks like aimbot+damage mod