Here a grenade (modified F-1) and the launchers for it.
They are made in the style of the first type of bayonet (grip/mount section) for the AK and I assume they are for this weapon.
The launchers appear to be factory made and all shown specimen do slightly differ what allows for the conclusiuon that these were made over a longer time period or even by different factories.
The grenade which is a F-1 body with an adapter that fits the launcher and a modified fuze.
As per the design it appears the grenade might be fired with regular ball ammo.
No further details are available.
Initially I thought an ID request in Russia / CIS states would have solved it soon but to my surprise it did not. Maybe these were made elsewhere?
Any body here who knows more?
Images from the web.