When it comes to AK style weapons, I am a greenhorn. My friend Jim on the other hand loves them and can talk about the minutiae variants that exist. However he mentioned this and it piqued my interest. The OTS-14 Groza aka Thunderstorm. It is a bullpup version of the AK.
Here is a Russian video about the Groza.
Here is a video of someone taking the OTS-14 apart. I am not sure how that forward trigger transfer bar works once it goes back into the AK.