How to Create a Simple Yet Effective DIY Air Gun at Your Home From Little Bits and Pieces Lying Around

This gun is a good pastime and like most other DIY products, does not need any special components but the thing about this is that you won't even need to step out of your house for it!
The materials required for this gun are as follows:
1) a 6 inch long copper pipe (like the one in a shower preferably with a 1/2 inch diameter)
2) a 1.5 - 3 ft long flexible rubber or PVC pipe (also with a 1/2 inch diameter)
3) a bicycle and/or car tyre foot-pump
4) a 1/2 inch gas valve (of any type you can find)
5) a large or medium-sized empty fizzy drinks bottle
6) a projectile
7) a one-way valve (from a car or cycle tyre)
8) some heavy duty epoxy glue
9) a roll of paper tape

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Step 1: Creating the Gun Barrel

First of all, you will be needing a 6-12 inch long pipe (made of copper, plastic or anything) which should be rigid. This will act as the barrel of your gun inside of which, you will place the projectile (bullet). The length of the barrel is entirely up to you. You could go with a longer barrel which will give you more accuracy but less distance or you could opt for a shorter barrel in which case the opposite will be true. ( I opted for copper and and a 6 inch pipe) You will easily be able to find it once you break open outer plastic casing of a shower.

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Step 2: Connecting the Rubber Pipe

The rubber pipe is actually a means of getting the pressurized air from the drinks bottle to the barrel. The pipe is recommended to be of rubber which is 5 to 6 finger-nails thick and will provide sufficient pressure-resistance and flexibility. the pipe should have connector rings (the tread which enables it to be screwed onto another component) on at least one end. On the other end, cut the rings off and fit the now plain pipe onto the outer side of copper pipe (in Step 1). Make sure the fit is tight, for added assurance, you can apply strong epoxy glue.

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Step 3: The Storage Tank an Release Valve

Put the connected tube and pipe aside for now and concentrate on the storage tank and release valve. The storage tank is a large empty fizzy drinks bottle covered with paper tape for added strength. Make sure that it is a fizzy drinks bottle because only those can withstand 150 psi of pressure. Take a gas valve, ideally made of metal and insert one end of it into a tread inverter which will change the negative tread of the valve ("into" which things fit) to a positive tread ("onto" which things fit). The pipe will later fit into this. Now take the cap of your empty drinks bottle and cut a whole in it just wide enough for the other end of the valve to fit in, you may do this with a simple hand-cutter, insert the valve into the cap. Now insert the cap onto the drinks bottle. Seal both these connections (cap-to-valve and cap-to-bottle) with epoxy glue. Next, you will need a one-way valve to allow for pressurization. You can easily get this from an old tyre or its inner tube. Cut a hole in the side of the bottle and wedge the valve inside sealing the connection with epoxy.

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Step 4: Assembly

Now its time to assemble the whole lot. Simply insert the vale into the rubber tube via the tread inverter and you've got yourself an air-gun (without its main engine that is!)

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Step 5: The Foot-pump

The "main engine" comes courtesy of a car and bicycle tyre foot-pump. The nozzle on the end should fit in to the one-way valve discussed in Step 3. The black end protruding from the back is a lock to stop the air escaping. So when using the foot-pump, you'll have to clamp it down in the direction of the red arrow shown in the picture.

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Step 6: The Projectile

Lastly, you have to decide on the type of projectile that you are going to be using. Whatever it be, it must fit snuggly into the barrel, don't make it too tight otherwise it may slow down the speed and distance measured just make sure there aren't any visible spaces between the projectile and the inner surface. I decided on using a plastic ball-pen rifle which has tape on one end to make it fit, this is best for indoor use as it is accurate, travels a good distance and isn't that dangerous (though don't hit someone unless you want it embedded half a centimeter into their flesh). For outdoor use you could go for a metal rifle or indeed anything you find useful or convenient

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Step 7: Final Assembly and Brief Guidline on Use

Everything is now ready so insert the nozzle of the foot-pump into the one-way valve and put the projectile into the barrel. Be sure not to pressurize the cylinder above 90 psi just to be on the safe side so it helps if your foot-pump has an integrated pressure gauge. Close the valve whilst pressurizing (of course!) and once enough pressure accumulates stand well back let er rip! Open the valve quickly so that all the pressurized air rushes in suddenly and creates the most thrust. I also strongly enforce that you change the bottle after around every 50-80 shots because there is a risk of it exploding after being constantly pressurized and de-pressurized.
HAPPY SHOOTING!!

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