Bottles in the twelve-ounce size are the most common and work very well for this purpose.
You will have to keep a grip on both ends to keep the twisted portion from righting itself. When the upper portion doesn’t squish but feels firm from the pressure, the bottle is ready.
Wide mailing tubes that people use for posters or blueprints work well, and you can easily find them at a post office or other mail supply store. Ensuring they are wide enough for the bottles is the most important part.
The removed strip will be 1⁄2 inch (1. 3 cm) wide and as long at the original tube.
Test that this tube now fits snugly inside the second tube. It should slide in but without being able to easily fall out. If, when you gather your tubes, you can find one that fits inside the larger barrel tube snugly, then you can skip this part, but most mailing tubes have too much size difference, and you just need to trim one.
Since you’re leaving 1 inch (2. 5 cm) instead of cutting from the end of the tube, you’ll have to poke a hole into the drawn rectangle and cut it out from there. In the finished product, this hole will be where the water bottle ammo falls into the barrel from a magazine.
Leave one of the long sides intact. This will create a flap at the end. In the finished product, this flap will act as the cartridge ejector for a bottle after you have launched the cap.
You basically want to make a funnel where the tapered end is large enough so that the mouth of a water bottle will fit through but not the entire bottle. The piece may have a slight dome shape like the lid of a Slurpee cup after you’ve made the cuts. In the finished product, this piece will stop each water bottle from being able to fall out of the tube entirely while still leaving a big enough hole for the cap to emerge before being fired.
This is where you will feed additional ammo into the magazine.
Notice how only one round (bottle) actually falls through the hole into the tube.
Don’t shove too hard since you will likely end up separating the funnel barrel from the larger tube where you attached it.
each hole perforate both sides of the tube in a perfectly straight line. [2] X Research source Use a drill bit large enough so that you can insert the paint can opener through the holes. [3] X Research source
You can use the wall-safe velcro types, which will even allow you to remove the velcro easily when you want. For select Nerf models such as the Recon, you can use the sight that attaches to the gun and slides off instead. Attach this piece to the tube, and you can clip the launcher to the gun where that slides and locks into place. [5] X Research source You can just as easily use this design without it being attached to anything else as well.
If you still have some of the old Nerf ball-type ammunition, these fit in the tube and fire effectively as well.
Just like an M203, the angle of the launcher is how you aim. [6] X Research source Practice firing it several times to get a feel for the trajectory of the launch, and then you will be able to aim proficiently in no time.
