Frank Iannamico's recently published AK47 - The Grim Reaper is an excellent resource for AK collectors and enthusiasts. It covers all the production AK variants from about a dozen countries, which include virtually every type of AK that will be encountered in the US. Definitely a reference book worth having. Find it at Amazon: http://www.amazon.com/gp/product/0982391803/ref=as_li_tf_tl?ie=UTF8&tag=forgoweapo-20&linkCode=as2&camp=1789&creative=9325&creativeASIN=0982391803