This is Saiga-12K-030. Unfortunely, not mine. The best version of Saiga, but it is against russian law, because the minimal lenght must be 80 cm, and this one may shoot with folded buttstock. Sometimes we have a possibility to buy it illegal on plant (in documents it lists as legal 040) about USD 2000-3000.
The main difference also is in gas operating camera like in Kalashnikov.