A grenade launcher for airsoft use that has fun written all over it is available at Evike.com. Matt takes a look a the TAG-ML36 launcher from TAGinn in this video... "The TAG-ML36 Grenade Launcher with its rifled TAGinn barrel is a shell-less launcher that fires TAGinn projectiles directly without the need of any launching "Shell". The TAG-ML36 is a mutual project of TAGinn and "Madritsch Weapon Technology".

TAG-ML36 is a pneumatic training system for the ML-40 launcher by 'Madritsch WT.'

This launcher may be installed on any 20mm under-barrel rail, or on a special standalone chassis. Powered by a 12g CO2 cartridge TAG-ML36 may shoot 8-10 consistent shots per cartridge."