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