Functional 40mm Airsoft Grenade

thingiverse

A fully functional 40mm airsoft grenade that can fire up to 9 BBs at close range requires just a single screw and a rubber band. First, attach "bolt" to the bottom side of "slider", or you'll be left with BBs stuck in the grenade after each shot. Next, thread up to five rubber bands, measuring at least 5-10 cm, through the holes on "slider". Secure them by pushing both ends through corresponding holes on "inner", but don't tie a knot yet! Mount "trigger" onto "main" using a screw, making sure it doesn't interfere with "slider" when fully compressed. Place "inner" into "main" and use a tool to push "slider" down until it clicks onto "trigger". Now, take each rubber band and pull it tight until it can't be stretched further, then secure it with a knot. Finally, attach "cap" on top and either glue the parts together or use tape to hold them in place.