Hi, in this Instructable I will show you how to make a really easy blowgun that fires Nerf darts.
Step 1: The Size
If you are going to make it out of paper, see below.
The size can be a bit tricky with paper, but there is a way too get the same size through the whole tube. Get you selected piece of paper and roll it up into a small tube, then get an accurate Nerf gun (I used a raider CS-35) and slide your small tube down the barrel, let the tube go and it will become the same size as the barrel. Before you take it out, check if the dart fits and have some small strips of tape ready, then pull out the tube (be careful not too let it unroll) and stick the tape down. Simple.
If you want to make it out of a bit of plastic tubing or pipe, see below.
This one is a lot stronger than the paper one. First, find a bit of pipe that is around 1/2 inch wide and cut of the selected amount of pipe. Slot your dart in and blow.
I hope you take out all your opponents, ninja style.