I took jasonm621's idea for an exploding dart and redesigned it for use with a .625Cal, 5/8" or 16mm bore blow-dart gun. I designed this dart so that the 209 shot-shell primer sits in the nose cone, facing the tail. the tail of this dart has a long shaft which houses the .177cal BB. When shot, the BB is held at the rear of the dart by the acceleration force. When it collides with the surface of the intended target, the BB is projected into the shot-shell primer. BANG! That is all. I now have added a new design with thicker walls for durability and some "feathering" for a spinning effect as it is projected. This may require gluing head to body depending on your printer's parameters. As always use responsibly, use safely, and most importantly...use your head! The CKD file is for use in Kubotek KeyCreator. USE AT YOUR OWN RISK!!! 1) install 209 shot-shell primer into nose cone. 2) place .177cal BB into tail section. 3) connect sections together, CAREFULLY 4) insert dart into blowgun, CARFULLY 5) Blow hard