Assault Rifle Headshot Kills Faster?

Has anyone noticed that sometimes when someone kills you with an assault rifle its almost instantly and sometimes the AR is a pos, I’m thinking headshots are instant kill with no shields which is bs. Please fix, the assault rifle should not kill that fast after dropping your shields.

That’s problems with the net code I think since I’ve been 3 shoted by the pistol before and killed by one bullet from the SMG with half shields.