The 40mm is rather interesting. Do you know if it is in service or just has been developed?
I wonder what has happened to the silent BS-1 grenade launcher in 30mm. I have never seen it being offered for export or any details on the grenades which supposedly being designated as VOG-T. Do you know more on these?
Here some details on the BS-1.
The grenade shown is missing the 9mm rod at the end, probably to conceal the function of the system (image from the Russian Kalashnikov book).