British rifle grenades were used during World War I to destroy enemy positions in fierce trench warfare. This product is a model up of one of several types of grenade launchers and remade so that it can actually fire airsoft. ●YouTube https://youtu.be/cNCfjh-ToOU https://youtu.be/COMZC9x5Bc4 https://youtu.be/erBxidG2lMU https://youtu.be/JoRdLEblMqM ●File format STL data of each part in zip file. ●Recommended print settings ・Printing speed：60％ (cups and small parts) ・Print in the same orientation as the image. ・Print with nozzles smaller than 1mm ●Screws required for assembly ・Hollow Set Screw ( M6×30mm )×2 ・Hex bolt( M4×15 ) ＆ Hex nut ●readme This grenade discharger is compatible with airsoft 40mm grenade shells, but please note that it has been tested within the legal limit of 0.98 joules with CAW shells made in Japan.