When it comes to AK type weapons, the ONLY thing the ATF cares about is if the auto-sear hole is drilled.......period. Without the hole, the auto-sear cannot be installed and the "fullauto" parts operate as a semi. There is nothing illegal about possessing or using these parts as is.
The reason M-16 parts are taboo in an AR is because there ARE ways to install an auto-sear without drilling or altering the receiver in any way. Guys were dropping in a DIAS or a link and pulling them out in about 2 seconds. There is no law against "consturctive possession". This is just a term the prosecutor used to describe a guy caught with an AR with M-16 FCG and bolt installed and a DIAS in his pocket. There is no such analogy in the AK world and thus the "full-auto" parts are fine to use. If you don't believe me, ask them. Or better yet, spend a couple of minutes on Google and you will find some of the gazillion letters from the ATF saying the same thing.