i read a official article of MW3 and it sayed there will be quikscoping

Gameplay

Like its predecessors, Modern Warfare 3 is a first-person shooter. Modern Warfare 3 will run at 60 frames per second.[7]

Infinity Ward revealed that Modern Warfare 3 will feature a new survival mode. Survival mode features one to two players fighting endless waves of enemies with each wave getting more difficult. Despite being much compared to the Call of Duty: World at War Nazi Zombies mode, enemies do no not spawn at fixed locations like the zombies did, but instead at tactical positions based on the current location of the player. The mode will be available on all multiplayer maps in the game and in the mode players can earn "cash" for items such as weapons, upgrades and ammo. [8][9]

Infinity Ward has recently revealed that it has revamped the entire killstreak reward system. They have stated that while Treyarch had slightly improved the system, it was not enough to make the system feel perfect. Infinity Ward has also revealed that they are removing annoyances that make players rely less on skill and more on perks. To do this, they are removing certain perks that give players a power advantage over others who do not possess the same perk. Quick scoping has also returned, having been absent in Call of Duty: Black Ops.[10]