40mm trip mine

once you have printed off you will need 4x 3mm X 10mm dome alan bolts to hold the firing pin supports then a 2mm thick pin, i used a 2mm drill bit and cut it down this holds the firing pin to trigger.
also need a 5mm bolt and nut to hold the trigger to support. once you put your 40mm grenade in the long tube put it to the main holder and hold both parts together with a 5mm thick o-ring size is down to you as tighter the better then add fishing line to the trigger then feed the line through hole