Aimbot and damage mod.  http://battlelog.battlefield.com/bf4/battlereport/show/1/890881202434254912/1783472269/

30 kills.  16HS.  66 shots hit.  AEK was used for 28/30 kills.  53% HSKR and 45% kills per hit (most theoretically possible would be 44 even if the 2 non-AEK kills did 100% damage each).

He's also gotten remarkably better this week.  3 months and 1 month ago when he played, he managed a single game with a KD > 1.  After a 30 day hiatus, he is popping off 3-7.5 KD's.

http://prntscr.com/g1fehc shows 39% HS with MX4 after 75 kills,  48% with P226 after 55, 54% with AEK after 46.