How to make a homemade Nerf Gun?

I was wondering how to make a homemade nerf gun out of PVC tubing. I would like to use a spring mechanism, but I might change my mind if I could get much more power out of something else. (I do not want to have to use batteries or other materials I will have to replenish)How to make a homemade Nerf Gun?
The best instructions that I have seen online for a home made Nerf Gun are available at: http://www.instructables.com/id/home-madHow to make a homemade Nerf Gun?
http://nerfhaven.com/homemade/



there are some designs you can look at, you are probably going to want to make a pump gun, would probably be easiest and most powerful.



http://www.instructables.com/id/home-mad



that is very easy one to make, if you want it really powerful, put on a 2 leter bottle instead of waterbottle, and make sure to get a good fitting barrel, 1/2 in cpvc or 1/2 in petg fit nerf darts good, make sure to make it like at least a foot long too

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