I found this webpage when I was looking for some info on sighting in my AK. Since I've never owned a rifle or obtained any experience with the maintenance of one I thought this sight was a pretty good read.
http://www.gunsnet.net/Linx310/sightin.htm is not a spam site for anyone who operates a Romanian AK. It is the #1 go-to site on the web for general information and "how to" advice. In fact, even non-Rommy users can and do benefit from the site.
I can vouch for that site the op refers to.
It is absolutely THE BEST "how-to" site on the AK-47.
I've done several of the tutorials I found there and turned my WASR 10/63 into a rifle I could stake my life on if need be.
I don't believe he sells anything on the site, it's just an information site. And one heckuva good info site to boot.