Here is an update regarding the Metal Gear series lifetime sales. The series has now sold 35.7 million copies worldwide. This number includes sales up until September 30, 2013.
Previous lifetime sales put the series at 35.2 million by the end of March 2013. This means they managed to sell 500.000 copies in the course of 6 months. Metal Gear Solid: The Legacy Collection launched in this period.
The next installment of the series releases next month, when Metal Gear Solid V: Ground Zeroes hits shelves worldwide.