"Finally had chance to install it on WE PDW. It feels very solid.
For adjusting the red dot, removed 2 metal caps located on top and side. They are hard to remove, but easier after the first round. Used a dime to adjust the red dot, it fits just right on the adjustment slit. No major issue on sighting it.
Only issue I had was the darkness of the sight itself. I think there is a tint on forward lens, it was very dark..., at least darker than any other red dot sights I have. Although it would be an advantage in the outdoor field use, might be too dark for indoor CQB.