78%HS with L86A2: http://battlelog.battlefield.com/bf4/battlereport/show/1/771697774866669632/992003509

83% kills per hit with L86A2 and LMGs (no sniper ribbons).  Couldn't reach 83% even if every single shot that wasn't done with the L86A2 was a headshot by a 100% kill weapon (and given the LMG ribbons and lack of sniper ribbons, that didn't happen): http://battlelog.battlefield.com/bf4/battlereport/show/1/649615375701054400/992003509

100 kills, 58HS, 35 shots hit(!): http://battlelog.battlefield.com/bf4/battlereport/show/1/648838417554119936/992003509