Quickscoping is having faster than normal reflexes with good accuracy while predicting the path of player movements. If u got used to ghosts quickscoping with no reticle, then it should feel similar here. Except unless u get a headshot or aim in on damaged opponents, then it won't be an instant kill. Its usually just easier to finish them off with another weapon or melee after if they still live with what lil health they have Choose a decent scope, memorize the ads speed with quick perks activated, know all the rushers traffic areas, and u can wreck many ppl. Of course if they have bad aim, are slow, predictable, and give u plenty of time to deal damage its their fault XD theyll just say you're a cheater when all u did was show a skill gap