NPO-AEG released an overview video of their RGM-40 "Kastet" airsoft grenade launcher. This can take in the 40mm gas grenade shells as well as the TAGinn grenades with the use of an adapter. It has a telescoping stock an original Kalashnikov grip, and even use the original weapon coating... "Overview airsoft replica grenade launcher RGM-40 'Kastet' (en. "brass knuckles") by NPO 'AEG'."