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The figure includes 4.5 million units of Call of Duty: Black Ops 2 on Xbox 360 and 2.9 million on the PlayStation 3, Gamasutra reports. Wii U and Vita figures are not included.

Activision recently published data showing that Black Ops 2 grossed $1 billion worldwide in fifteen days since going on sale. The figure was based on internal sell-though estimates, retail data and official Chart-Track information.

Last year's Call of Duty instalment, Modern Warfare 3, sold a record-setting 8.8 million units in its first month in the US - 10 percent more than the previous year's Black Ops.

Earlier this month trade analysis suggested that Black Ops 2 could be down by as much as 20 per cent on day-one sales compared to its predecessor.

This led to some commentators asking whether the franchise's appeal has plateaued or, perhaps, declined. However, Black Ops 2 remains on course to be the highest grossing packaged game of 2012 by some margin.