Introduction: 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.

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.

Step 3: Temporary Containment Vessel

The purpose of this tank is to hold the pressure of the big tank but in a very small volume.So the valve would be used to charge this small tank then that valve is closed and then the trigger is pulled and this small volume of high pressure gas exits the barrel taking the BB with it. The smaller the volume of air the less air you use out of you main tank. I have added water so this is adjustable, hence water is incompressible.

Step 4: The Valve

The valve is just a standard three way used for splitting water to different hoses from one tap.To use the gun open the valve from the main supply tank and this will charge the temp tank with air, close the main tank and fire.

Step 5: Make a Main Tank Pressurizer

the pressurizing station consists of a two way quick connect connected to a quick release this has a hose and a schrader valve for filling from a car pump.Simply connect the main tank onto this and recharge, each tank should give you about 50- 70 shots at 120 PSI.

Step 6: Be Careful!

enter longer description for this step

Comments

author
Fake_Name (author)LasVegas2006-12-29

You can buy a knife at most any store... OMGWTFBBQ YOU STAB YOU EYES OUT! Seriously, stop freaking out about safety.

author
Bloody Baron (author)Fake_Name2008-03-24

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).

author
Teachable (author)Bloody Baron2013-08-03

Yescsafety goggles seem appropriate.

author
Kaiven (author)Fake_Name2007-09-03

you must have never hurt yourself, therefore you think saftey is not important

author
yomama1800 (author)Kaiven2007-12-27

or died that suck it hurt lol hmmm...3..2...1...yeah you got it

author
pooboy (author)LasVegas2007-03-02

i watch a christmas story every year

author
bylerfamily (author)pooboy2009-02-11

Me to.

author

I also watch a christmas story every year !!

author
Dolye Kong (author)LasVegas2010-01-28

lols

author
Dolye Kong (author)Dolye Kong2010-01-28

necro

author
Allo (author)LasVegas2007-01-05

Your obvious reference to "A Christmas Story" is lost on these fools, I fear...

author
Danny (author)LasVegas2006-12-15

okkkkk ttthhhheeeennnn..... lol

author
Rdav- (author)2011-04-11

Looks cool, but exactly how powerful is it?

author
techno guy (author)2011-03-30

What's a PET drink bottle?

author
Rdav- (author)techno guy2011-04-10

Any large drinks bottle, pet stands for Polyethylene terephthalate, the material they are made from

author
zipzapper859 (author)2010-01-08

Y do u need so many connection and different pieces/......
could u make it so it looks more like a rifle or something

author
Colonel88 (author)2009-11-19

 Best ammo ever is called "Piano Wire" It's like metal stiff wire that can pierce wood (?) but will definitely pierce thin wood.

author
master8night (author)2009-09-24

Nice idea dude nice

author
hipeople (author)2009-07-16

Where did you get the hose sprayer thing?

author
tehgreatiam (author)2009-05-22

it looks so small in the picture

author
sharlston (author)2009-04-28

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

author
sharlston (author)2009-04-27

check out my instructable its simmiliar

author
CrustyCrayon (author)2007-06-23

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.

author
nerfer192 (author)CrustyCrayon2007-11-16

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.

author
bylerfamily (author)nerfer1922009-01-13

What is mythbusters?

author

a tv shows on discovery channel

author
receiver545 (author)CrustyCrayon2008-02-12

one thing you missed was on mythbusters they used a long barrel to increase accuracy and to increase momentum .

author
smokehill (author)CrustyCrayon2007-11-12

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.

author
imthatguy1125 (author)2009-04-03

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

author
Bloody Baron (author)2008-03-24

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.

author
pobbop (author)2008-02-24

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.

author
dryicebomber! (author)2006-12-24

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.

author
yomama1800 (author)dryicebomber!2007-12-27

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

author
gnose (author)dryicebomber!2007-05-20

and youll need armour of some kind. youre practically re-inventing the pressurized-air hand fragmentation grenade. itd work, but itd sure be heavy

author
smokehill (author)gnose2007-11-12

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.

author

hunting weapon!
illegal around here =(

author

lame :/ things like this should be legal.

author
nerfer192 (author)2007-11-16

um will this puncture cardboard? with airsoft?

author
killerjackalope (author)2007-08-03

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

author
killerjackalope (author)2007-08-03

experiences of water bottle rockets etc have withstood pressures of 120PSI that was a coke bottle but 500Ml bottles are even stronger pressure wise also a we built a similar item at 250 PSI out of a random bit of pipe with the perfect diameter but the most fearsome weapon was heavy gauge hosepipe with marbles down it, add a needle valve and 200 psi but about half the marble flew out till a mishapen one got stuck and the hosepipe burst....

author
CementTruck (author)2006-12-12

Would a little water and dry ice in the larger tank mean you could fire BBs longer without refilling the tank? That could be a "portable" pressurization system.

author
knexer1 (author)CementTruck2007-04-07

dry ice is too dangerous for use with a plastic bottle (do a video search for "dry ice bomb") If you use dry ice, only do it with a metal container that has a pressure relief valve on it.

author
theRIAA (author)CementTruck2006-12-12

"uh oh, its jammed." *blows arm off*

author
e1337 (author)2007-04-05

Cool i made one with a few of my twists, like an autoloader, and i enjoy going airsofting with it.

author
aggememnom (author)2007-03-17

now that is cool

author
kronos (author)2007-02-16

were did you find this piece of crap

author
lukeRAMBO (author)2007-01-29

pretty dammm sweet but do u know how to make it faster to reload instead of pumping up the tank if you find out a way please tell me

author
lukeRAMBO (author)2006-12-14

hi cool BB gun design it is simular to my pump air blowgun with the same trigger design keep up the good work, you should look at my instructables

author
erfonz (author)2006-12-12

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!

so a BB gun is more practical than a paintball gun?

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