Instructables

Gift Home made high power air BB gun for Christmas!

This instructable is on how to make a home made BB gun out of very commonly available parts, i have spent ages researching and developing this design to make a cool Christmas present for someone.

I was in the progress of making a home made paintball gun, but the practicalities of it were just stupid. So with a little modification i made a much better BB gun!

Warning: This thing is VERY powerful even with a moderate pressure of 50PSI.

 
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Step 1: Make the gun/barrel

First of all you're going to have to find a garden spraygun with a removable head set up, preferably it must have the trigger in front and be able to release air pressure very rapidly.

Amazingly i found a PVC component that screws exactly onto the spraygun.

The next component is a piece of 21.5mm PVC pipe with a garden hose quick connect thing glue inside.

The alu tube of 6mm or close as possible internal diameter (the closer the more powerful) friction fits with a piece of sticky tape inside of the quick connector.

The length of the barrel has a big effect, the longer the more accurate your BB will travel but at a risk of slowing it down over the length and the shorter it is the faster it will travel withing reason.

Step 2: High pressure tank

The high pressure tank can hold about 120PSI, it is obviously made out of an old PET drink bottle.To make the connection on the lid you have to make a hole the size of the shoulder of a quick connect coupling and cut away the rest of the coupling that doesnt fit in the lid, then put washers to completely seal it. The hose and connectors: the first connector is just a normal one but the end one has got a valve so when u disconnect it from the filling station it all stays in the vessel.

If you can afford to, rather get the brass connectors they can hold alot more pressure without leaking, and you will have a much more reliable system.
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LasVegas8 years ago
You can buy a knife at most any store... OMGWTFBBQ YOU STAB YOU EYES OUT! Seriously, stop freaking out about safety.
no kidding high pressure is serious stuff, it might seem like a load of hot air but even a slight weakness in the materials can spell devastating consequences for the user (maybe the plastic would blow up and take part of your face with it).
Yescsafety goggles seem appropriate.
you must have never hurt yourself, therefore you think saftey is not important
or died that suck it hurt lol hmmm...3..2...1...yeah you got it
pooboy LasVegas7 years ago
i watch a christmas story every year
Me to.
I also watch a christmas story every year !!
lols
necro
Allo LasVegas7 years ago
Your obvious reference to "A Christmas Story" is lost on these fools, I fear...
Danny LasVegas8 years ago
okkkkk ttthhhheeeennnn..... lol
cam.dav323 years ago
Looks cool, but exactly how powerful is it?
techno guy3 years ago
What's a PET drink bottle?
Any large drinks bottle, pet stands for Polyethylene terephthalate, the material they are made from
Y do u need so many connection and different pieces/......
could u make it so it looks more like a rifle or something
Colonel885 years ago
 Best ammo ever is called "Piano Wire" It's like metal stiff wire that can pierce wood (?) but will definitely pierce thin wood.
Nice idea dude nice
hipeople5 years ago
Where did you get the hose sprayer thing?
tehgreatiam5 years ago
it looks so small in the picture
sharlston5 years ago
WRAP DUCT TAPE AROUND EVERYTHING TO MAKE IT SO IF IT DOES BLOW UP IT ISNT AS DEVASTATING PS SORRY ABOUT THE CAPS MY CAPS BUTTON IS STUCK
sharlston5 years ago
check out my instructable its simmiliar
hmm. i think the thing about a shorter barrel being slower may not actually be true. It depends on the situation, but on Mythbusters they made an 80 foot barrel to try and propel straw thru a tree.
yeah but in mythbusters, the barrel was bigger than the projectile, and air did not push the straw, a cotton ball was pushed, and that pushed a straw, its different with nerf guns and stuff where the projectile fits snuggly in the barrel and the air pressure eventually equals and the bullet is still halfway down the barrel, then gets stuck.
What is mythbusters?
a tv shows on discovery channel
one thing you missed was on mythbusters they used a long barrel to increase accuracy and to increase momentum .
In firearms, generally the longer the barrel, the higher the pressure, and muzzle velocity. Comparing muzzle velocities of a 2", 4" & 6" barrel of the same model will always show this. Same holds true for velocities from a .357 carbine compared to a .357 pistol. There is undoubtedly a point where you COULD get diminishing returns from a longer barrel, theoretically, but I don't think it's encountered in normal barrel lengths in normal firearms. However, with the far lower chamber pressures and muzzle velocities in these air-driven devices, I can believe you might lost velocity with a longer barrel, ESPECIALLY if the fit between the BB and the inside of the barrel were a bit sloppy. In firearms, you will recall, the fit is extremely tight, thereby holding pressure all the way down the barrel.
mount it on a rifle cut frome wood and add a pump with a spring so it open the valve to charge the mini tank. the only proplem would be adding a a mag
High pressure and tape don't exactly add up so I dont't think that any sort of tape should be used in any stage of the construction of this gun. It could result in injury or it could reduce the effeciency of the gun.
pobbop6 years ago
wraping one or both bottles in ducttape would be a cheep, eficent and light way to reenforce the bottles. id still use only 150 PSI though. airsoft is made of plastic or ruber and would slow down or even stop in the barrel if it was not lubercated. brass shot would work best.
Hi, I like the idea and also think you could use DRY ICE to pressure up to 500-800psi "in a metal tank". It would would need a regulator of some kind.
i thought about that but dismissed the idea because of having to refill it after it ran out of dry ice and that that stuff is fairly dangerous in the wrong hands
and youll need armour of some kind. youre practically re-inventing the pressurized-air hand fragmentation grenade. itd work, but itd sure be heavy
smokehill gnose7 years ago
While this is a really clever design, and a very well-done project, I have to agree that this could be really dangerous, and I'd personally never want to handle it. I've seena lot of plastics fail under pressure, especially in cold weather or after sunlight (UV, I guess) had degraded the material -- PVC & CPVC, especially. And I've used a lot of the quick-release plastic fittings around the farm. Sometimes you get lucky, but most of them have failed eventually, often with very messy results. I still use them occasionally (only with usual water pressure, never with a booster), and only until I can get a brass fitting to replace it. I know it would drive up the cost considerably, but doing this strictly with metal parts, no plastic, is the only truly safe way to do this. It just ain't worth the risk of having a bit of fractured plastic blasting into your eyeball. Or genitalia. Not to be a wet blanket, but there's a reason things like SCUBA tanks, oxygen tanks, etc., are carefully tested & certified. Pressure can hurt or kill you, with a bit of bad luck, and we should keep this in mind when we fiddle about.
hunting weapon!
illegal around here =(
lame :/ things like this should be legal.
nerfer1927 years ago
um will this puncture cardboard? with airsoft?
sorry for double posting but a very handy adapter for the bottle is a truck valve (part that goes into the rim) the stay in quite tight anyway so get cheap superglue and coat it in that to slide it in then use a good strong epoxy glue for assurance
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