A 3d print of a blowgun mouthpiece design to give you more power. This mouthpiece was made for .40 cal blowguns, the rest of the pipe is simply better off purchasing at https://amzn.to/4b58jCU (Affiliate link)
Very simple design. Will produce a tight fit, and does have a safety ring, to keep the darts from falling out of the gun, or in the user's mouth.