Within 24 hours of the game going on sale , It sold more than 7 million copies , 5.6 million in the U.S. and 1.4 million in the U.K. , breaking the record which was set by its predecessor Modern Warfare 2 by 2.5 million copies . Within 24 hours of going on sale , the game sold more than 7 million copies , 5.6 million in the U.S. and 1.4 million in the UK , breaking the record set by its predecessor Modern Warfare 2 by some 2.5 million copies .