In a new interview with PlayStation LifeStyle, Infinity Ward’s Multiplayer Project Director Jordan Hirsh confirmed that quickscoping is in fact possible to do in Call of Duty: Infinite Warfare. He did caution, though, that it is not easy to actually do so.
Quickscoping is possible. I wouldn’t say it’s easy! Most of the sniper rifles are balanced to be a difficult one-shot kill. So you have to get a headshot in order to get that one-shot kill, (especially) quickscope. So it is a possibility.
He stated that the sniper rifles in the game have been balanced in way that makes it possible to get a one shot kill only with a headshot.
SOURCE: PlayStation LifeStyle