Red Dot Sights / Reflex Sights and Holosights Explained
While researching the difference between red dot and reflex optics I found this great article on UltiMAK, an AK47 site. The font is a bit small so you may have to zoom in on the website to read it comfortably.
Scimmed over the article, will read it in full lenght tonight when I get in from work. Looks like it will explain a lot of questions I have since I'm trying to decide what to buy for my 522.