One hundred percent bs.  His skill is at almost 500 and his k:d is terrible.  After speccing him it was obvious.  Once he noticed I was in spec he toned down the hs but still shot through smoke and aimed at walls.

HSKR's very high for his low actual skill.   https://www.247fairplay.com/CheatDetector/bytegrinder

Good spec demo here.  Shooting through smoke and random bs headshots.  https://www.youtube.com/watch?v=8t6_HVo96dM

I ended up banning him on TG Locker, the killfeed says it all.   http://xe.site.nfoservers.com/dev/kills/?filter=bytegrinder&date=20170815&server=1

http://battlelog.battlefield.com/bf4/battlereport/show/1/897982993119605952/381426935/

http://battlelog.battlefield.com/bf4/battlereport/show/1/898023943652836608/381426935/

http://battlelog.battlefield.com/bf4/battlereport/show/1/897979659029495232/381426935/