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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<p>very tanks</p>
could i use blow gun ammo?
A lot of early air guns worked this way, there's one mentioned in one of the Sherlock Holmes stories by Arthur Conan Doyle.
Hi, can basic glue from a glue gun can do the trick?
Hey! I got the exact same foot pump, but I lost it :( I don't know how, but I think I saw something like this from a movie. I forgot the title. The guy had a huge air tank connected to this thing which fired nails at his victims.
no country for old men is the movie i think
Tread inverter? Seriously? Dude, learn how to speak before posting on instructables.
Check out my Ible its a m25 homemade sniper... Air powerd plus its semi auto and it looks just like one as well please go to<br/><a href="https://www.instructables.com/id/M25-Semi-Auto-homade-puenamic-sniper/">https://www.instructables.com/id/M25-Semi-Auto-homade-puenamic-sniper/</a><br/>
this rocks
would it be safe to use one of these with a hexagonal barrel to shoot plumb bobs?
The principle driving this is that air pressure pushes the projectile forward. So you can use this principle in any way. Have a hexagonical barrel, a really fat one, a really thin one, anything. The only thing that has to be kept in mind is that the projectile should be a snug fit in the barrel, the pressure vessel should be able to take the pressure and that there aren't ANY leaks in the gun.
i was asking if it would be <em>safe</em> to shoot SHARP METAL WEIGHTS out of this, not if it was <em>possible</em>.<br/>
uhh....try using common sense. NO!
uh... i has sanity issues. and no common sense. and a minigun. for paintball.
how far and powerful does this shoot?
If you pressurize the vessel to 60 PSI, it travels ~30 feet before starting to loose height, though my projectile was pretty loose in the barrel so you might get better distance if its a tight fit (not too tight though). As for the power, I found it to be surprisingly powerful. I tried it on my finger at point-blank range (lol) and it punched a ~5mm whole in it and started to bleed o_0
why have the masking tape wraped round it?
how much does it come to? Looks small enough to smuggle to school.
Not much, depends on how many of the bits you already have. For me, the only thing I had to buy was a gas valve which set me back only $1 lol. As for smuggling to school, well........safe to say you'd have a hard time fitting it into your school bag, but if you used smaller bottle then it should be possible, but with the 1.5 liter bottle I used? Fat chance :P
.....o-0 why is this in the travel competition? looks good, unfortunately i dont have all the pipe fittings and valves, i guess ill just have to stick with my blowgun...lol
I'm also wondering why it's in the robot contest?
probably entered it in all the competitions for the publicity
looks like fun :D good job.... i still wouldn't build it but it looks easy enough

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More by Ali_Athar:How to setup a virtual machine? How to overclock Intel CPUs? How to create a simple yet effective DIY air gun at your home from little bits and pieces lying around  
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