Available at eHobby Asia right now is the CYMA 40mm Airsoft Grenade Launcher that can be used as handheld standalone launcher or can be mounted to a railed handguard... "This has a polymer pistol grip and the rest is full metal. This launcher is robust enough to withstand every bang and with the 20mm top flat rail can be attached with any tactical accessory. It is suitable to launche most 40mm airsoft standard gas grenades and it can also take a short type Cartridge Shell.