WantChinaTimes, they report nothing but rumors. The purchase has not been confirmed.
Pakistan is considering buying the Mi-28 from Russia, along with Mi-35 for it's ANF operations.
it has a gun a 2A42 30mm cannon but it's not on a turret.
The gun is trainable over a range of -2°30' to +9° in azimuth and +3°30' to -37° in elevation.

