Initially unsure, suspected cheat, then when I followed the player, he left. When he returned, he started using m9 pistol and one shot killing very quickly with said weapon.
https://battlelog.battlefield.com/bf4/battlereport/show/1/953910764821905216/1571679464/
https://battlelog.battlefield.com/bf4/user/mother_fk_86/
Banned.
Thanks for the quick and good work.
Thanks for reporting!
/closed