I recommend going to http://warriortalk.com/ and signing up as a member there (it's free). Unfortunately, one can't just read the forums without registering.

They have a Kalashnikov section to the forum with literally tons of information to sift through. Even though he's controversial, Gabe Suarez knows a lot about the AK platform. Not to mention the sponsors over there such as Jim Fuller, Sonny Puzikas, Krebs rifles, etc.