BB Gun Enthusiasts, Reuse Your Soda Bottle: B.B. Bottle Boom

Ever wanted a cheap, but functional target that blows up when you shoot it with something? Well, you can make one with things you can find just lying around the house.

Please vote this project for the TapdN'Y Contest. If you love shooting BB guns at targets other than animals, why not? And if you don't want people to kill animals, vote this so they'll have something else really fun to shoot at! XD Thanks and enjoy!

Step 1: Materials & Tools

Materials
1. Any plastic soda bottle or similar. One of those economic shape water bottles are advisable because they blow up easily which is why you don't want to be pumping these up more than 50 psi, but you can use a regular 2 liter soda bottle. Just don't make it too thick because you don't want any ricocheting BB's or pellets (trust me, I shot a pellet gun at this thing from 10 yards and the pellet whizzed right back past my ear).
2. Teflon tape
3. (optional, but helps the seal) Silicone caulk
4. Some sort of flexible tubing with a radius not bigger than half or 3/4 of the bottle cap's radius. I used some pretty thick walled 1/4" black irrigation tubing I found lying around.
5. Duct tape

Tools
1. Either a drill or something you're able to heat up red-hot (like a paperclip), with a diameter that is about as big but is not bigger than your tubing
2. A bicycle pump
3. IF you're using a paperclip: a heat source like a stove or torch of some sort
4. Also IF your using a paperclip: some pliers to hold the paperclip while it's hot.
4. And that's it :D

Step 2: Drill a Hole in the Cap

Self-explanatory.
First, screw the cap off of your bottle.

If you have a drill:
Drill a hole all the way through the center of the top of the cap.

If you have a paperclip and a heat source:

To prepare, it would be advisable to draw a circle around the section of the bottle cap that you're going to remove.

First, unbend the paperclip. Just the first segment or two should be fine. And of course, grasp the unbent part with pliers.

Next, turn on your heat source, and then heat the first inch or so of the paperclip until it's red-hot.

Make a hole through the cap somewhere on the circle that you marked, then move your paperclip device all the way around the circle, cutting through it. Eventually, the circle will just fall out. You might need to reheat the paperclip during the process if you don't have enough heat. Just re-insert it into the cap to finish your cutting afterwards.

Sand the inside JUST A LITTLE BIT to remove burrs and even out the circle if you need.

Step 3: Inserting the Tubing

Cut a small 3 inch section of the tubing. This is all the tubing you're going to be using.

On one end, wrap teflon tape around it tightly, about 4 rounds.

If you have it, spread some silicone caulk around the teflon tape to double the seal.

Finally, screw off the cap and insert the non-teflon-taped end through all the way until you've reached about 3/4 of the way down the teflon tape and caulking you put on.

Cap the bottle tightly.

If you used the caulk, allow it to dry overnight before the next step. I know, I know... the hardest step of all.

Step 4: Pump It Up!

Get your bicycle pump and attach the hose to the tubing and secure it. Also, get a 3 inch strip of duct tape ready.

Pump it up to 45 psi if you have the eco-shape bottle, or up to 55 psi if you have a 2L soda bottle.

With the pump still on, bend the tubing in half until one section of the tubing touches the other. This is why you prepared the duct tabe ahead of time. Now, wrap the duct tape all the way around both halves of the tubing. Great job! You've got the air sealed in there!

Detach the pump.

Step 5: FIRE!

Have fun shooting!

You'll probably be able to reuse the cap on another bottle once your initial one has gone KaBoOm, just so you won't have to make another cap assembly and endure the torture of waiting overnight for it.

I'm sorry for no REAL pics of the project. The sun's down right now and I don't have all the materials handy. I hope I can upload them tomorrow!