Damage modding the U100, it appears.  38 lifetime kills, 25 HS with it, 60 total hits for 66% HS and 63% kills/hit.  http://prntscr.com/gfm6ex

 11 KPM, 11 kills by Type88, 0 HS from best weapon, .37 kills/hit from 24 damage weapon on 100% health server:  http://battlelog.battlefield.com/bf4/battlereport/show/1/902947802591422656/1880568474/

16/21HS, .78 kills per hit from 24 damage weapon which should have resulted in at most .49 kills/hit: http://battlelog.battlefield.com/bf4/battlereport/show/1/902546710917159488/1880568474