So as you can see in this video, all the hits were actually registered. Not even a lag problem. You can see the shots, the hits, the blood, the reaction.. AND that this dudes just keep on fighting.
I dont say that all of this shots were killshots (most automatic fire even missed! yep i know), not all of them were at "vital organs", but i am strongly the opinion that almost all of the guys in the video should be at least incapacitated, not able to fight back, or unconsious. No modded server.
Compare this to some police activity videos..