This guy is a headshot machine.

http://battlelog.battlefield.com/bf4/battlereport/show/1/1019062558539732480/860666079/ 152 Kills, 72 HS

http://battlelog.battlefield.com/bf4/battlereport/show/1/1019050037795706368/860666079/ 43 Kills, 24 HS

http://battlelog.battlefield.com/bf4/battlereport/show/1/988963703532509312/860666079/ 60 Kills, 28 HS

Near enough 50% HSKR on most of his recent rounds, doesn't seem legit to me.

https://bf4db.com/player/860666079/snapshot/13007