This AK sub-category is dedicated to carbines and pistols derived from Russian Vityaz and its civilian variant SAIGA-9.

American company Kalashnikov USA is manufacturing almost identical clone of Vityaz which is called KR-9 and a pistol version KP-9.

This weapon is built on a blow back model (all other AKs employ gas piston driven reload mechanism).

This is a 9x19mm  AK variant. You can look up more info in google.