Uncharted series has sold 28 million copies (prior to Uncharted 4)

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http://www.foxbusiness.com/features/2016/05/10/sony-playstations-uncharted-4-poised-to-chart-top.html

Pachter predicts “Uncharted 4” will sell well, but the install base will limit sales: “It likely will sell between seven to 10 million units.  It's hard to attach at a rate higher than 25% of the 40 million PS4’s out there.”

Overall the “Uncharted” franchise has sold more than 28 million copies, according to Layden.

It's not clear as to whether it includes Golden Abyss or not. VGC has the series at 24.24m (sold-through numbers and without digital sales).