What makes a semi auto AK wasr10 semi auto?

Answer 1

Receiver redesigned so that a full auto trigger group cannot be dropped in without extensive modification by someone qualified to do such work, redesigned trigger group which cannot accept an auto sear. If you're trying to figure out how to convert one to full auto, you need to stop right here - unless you possess a Type 7 FFL with the necessary Special Occupational Tax stamp to manufacture full auto firearms, attempting such a conversion is going to leave you with a non-functioning firearm (the most likely outcome), or 10 years in prison (if you somehow gain the know-how and make a successful conversion).