I know this is obviously not intended behaviour, but it has happened so many times now that I’d rather put it in gameplay feedback. Snipers VERY often hit you the moment they get line of sight on you. No laserpointer, no sound-queue, you peak your head out and BOOM they hit you for half of your health. And they can hit you through solid objects VERY often. It is especially fun if both effects are combined. You walk around, hear the warning call for sniper and BOOM you get hit out of nowhere.
Fun!