What's the real zoom of 15X scope in PUBG?

Content maker WackyJacky101 released a new video revealed  a dark secret of the rarest object in PlayerUnknown's Battlegrounds - 15x scope. As the author found out, in reality the sight has not 15x magnification, but only 12x (with maximum zoom, with minimum - 6x).

Recall that the sight 15x can be found only in Air Drop containers. Chance of appearance is only 5%.