Gift Home Made High Power Air BB Gun for Christmas!

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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

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    54 Discussions

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    Fake_NameLasVegas

    Reply 12 years ago

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

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    Bloody BaronFake_Name

    Reply 11 years ago on Introduction

    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).

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    KaivenFake_Name

    Reply 11 years ago on Introduction

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

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    pooboyLasVegas

    Reply 12 years ago

    i watch a christmas story every year

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    AlloLasVegas

    Reply 12 years ago

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

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    DannyLasVegas

    Reply 12 years ago

    okkkkk ttthhhheeeennnn..... lol

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    Rdav-

    7 years ago on Introduction

    Looks cool, but exactly how powerful is it?

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    Rdav-techno guy

    Reply 7 years ago on Introduction

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

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    zipzapper859

    9 years ago on Introduction

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

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    Colonel88

    9 years ago on Introduction

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

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    hipeople

    9 years ago on Step 1

    Where did you get the hose sprayer thing?