I've uploaded an image from a real scope (ACOG) and one of the Arma scopes (RCO). There is a drastic difference in glass quality.

The airsoft knockoff Elcan replica is much brighter with very little light loss and reflection. We should expect $1000 + optics to perform even better.

The glass in the game is dirty and appears covered with debris. What additional information do you need? Would you like images looking through real optics to compare with the images from the game?