'Pneumatic' Pen Gun Thingie




About: merchant marine engineer

Annoy your coworkers using a homemade air-soft pen/gun!

Step 1: Gather the Parts

using 2 special pens you will have the ability to shoot little paper balls really far and really fast (ok i'm exagerationg a bit...)

Those 2 pens are really common in France (i'm French) and are both from the same brand 'Reynolds'.

1st is a ink-eraser/rewriter pen. (top one in the image) it's like 2 pens in one, White half erases, Blue half rewrites.

2nd pen in just normal ballpoint pen (nevermind the color)

ok now why these pens in particular?? because the 1st one has a little "piston" inside to separate his 2 parts and this is movable inside and makes air compression possible! tadaaaaaa! (get it?)

ok it'll be clearer later.

you also need a razor or a sharp knife and some paper.

Step 2: Preparing:

alright now that you got everything you need to chop off some things you don't need!

On the 1st image here you can see the two pens without the caps (don't need those)

I'm made little arrows to show you where to cut, you just need to remove the tips of every pens.

(be careful with the eraser/rewriter one because inside are 2 (a blue one and transparent one) tubes/ink reservoirs, it won't spill or anything but some ink can get on you or on your desk and it's a bummer.)

then on the 2nd picture you can see what you keep! (colors are different on mine 'cause it's from an old 'gun' of mine)

final parts:

tip from the ballpoint pen = cannon
shaft from the eraser = cylinder
little piston thingie that was separating the two inks = piston
Ink tube from the ballpoint pen = piston rod

goood you just need to assemble now (yeah it is really that fast and easy to make!)

Step 3: Assembly:

good, now you just need to get everything together:

put the cannon inside one end of the cylinder, thin end first, and the piston at the other end. the rod will be used to push the piston far inside and compress the air! (after some use you'll find easier to get a bigger rod (no mis-interpreting here please).

In order to get a compression you need to seal off the other half of the tubing, the cannon. and that's where the ammunition comes in: paper.

yeah plain old paper.

so take a little piece and chew. yeah yeah put it in your mouth and chew! (try to take a blank piece of paper, 'cause you don't want your boss to see your mouth blue of ink when you smile...)

once you get a small wet ball of paper, stuff it in the cannon and press hard into the bottom of the cannon using the rod/inktube, press hard because this will seal off the whole thing. this process is like the recharging of early 19th century rifles. (maybe it's 18th century i don't know...)

now you're ready! put the rod in place and aim! (cannon facing away from you)

and shoot by pressing hard and quick and Blam!! (it does make a noise like that) the little piece of paper is propelled forward like Superman on Steroids! into the hair of that beautiful 'secretaire' who was just passing by ... that same 'secretaire' who you wanted so badly to ask out but never had the courage, but hey! let's rejoice you won't have to ask her out after that because she'll say no anyways!!

so yeah don't shoot at people in general, you don't want this little squishy paper/saliva thingie to go in you eye, do you? it's dangerous and bio-hazardous.

so kids, play nice and clean up your mess afterwards!



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    18 Discussions


    9 years ago on Introduction

    oh, and this isn't pnuematic. Pnuematic is air powered, this just hits a shaft into something to make it move

    1 reply

    Reply 9 years ago on Introduction

    This is kinda pnuematic in a sense. The shaft is forcing air down a barrel "air powered". the force of the air is pushing the projectile out. However there is no actual air chamber and no release of a mass amount of air at once. So I can clearly see why you would state this is not pnuematic.

    Way of,f in the long-lost land of Youth, we'd construct similar firing-pieces, from clear Bic pens and orange peels.


    10 years ago on Introduction

    there is a instructable that has the same purpose its by bangbang007 when ur searching something click on people and search his name then click on it and the 1 that says mini air gun is the one so click on that and there u go now its world wide :) (there is always a solution) all u need is a bamboo chopstick and a pen and knife and u built the same thing as the french dude did happy evry 1??


    11 years ago

    dont freakin post stuiped stuff like this if theres somthing just in france and we need it for here then how are all the other ppl ganna make this huh

    3 replies
    figt fire with firegunmanx

    Reply 11 years ago

    Yo ouch this is good who knows i coul, i could live in france, it would help me.


    11 years ago on Introduction

    nice pengun ..but it should be world wide.....but is this technology or engineering save for children.......?


    11 years ago

    dont listen to "ouch" this is cool


    11 years ago

    its realy hard 2 under stand?!? =(


    12 years ago

    those pens are like tip ex for fountain pens, they dissolve the ink.

    bored boy

    12 years ago

    works well


    12 years ago on Step 3

    lol funny cool t is there anyway to do this with american pens?


    Reply 12 years ago

    Though these types of pens, I've Never Ever seen before, so this project may be limited to French borders. =( Or atleast, as far as Reynolds ships. lol


    Reply 12 years ago

    yeah Sorry, I thought there was some outside of France, in Europe maybe. I hope there are some French people here would can do this. France anyone?