Just noticed after the vk singh sir holding rifle,the SSS receiver is significantly smaller than typical ak receiver.
Typical ak stamped receivers have gap between under the barrel n the receiver,even in modern ak12/15 receivers.
free floated lower hand guards use this space for attaching lower hand guards.
The reason the space exist because,the pronounced sloping bottom has to accommodate(or act has a) the mag well,
trigger group assembly and the pistol grip.
Sss reduced the height close enough to house the trigger group but not enough room to for mag well. So they added a new mag well.
The reduction of height also means,the position of typical ak pistol grip will be few centimeters higher,so I speculate they added an ar mount.
That new image shows that gas tube ends few centimeters before the trunion,looks like it is free floated(typical ak gas tube would be tightly secured with rear sight post).
Theoretically Free floating the gas tube along with barrel will improve the barrel harmonics.
Afaik Arsenals ak 20 have that feature.
Only thing baffling to me is,in that cad image, in the ejection port something strange going on.
We can see the what appears to be the chamber area which is visible. Usually ak bolt sits flush with the trunion.
One explanation is It's possible they took picture of half cocked position.
Otherwise the bolt appears to be a typical ak bolt.