Does anyone remember these being in the media spotlight some time ago? They were typically around 3" x 1", had two barrels and were supposedly made to fire "gas cylinders".

Apparently, they could be bought in Southern Europe for as little as $20. Depending on where you read it, they fired two .32/.38 bullets by pulling on the keyring to cock the action, and firing the barrels independently.

Does anyone know where blueprints, diagrams or detailed photo's can be found?

They certainly look very simple to build on a milling machine, but I would be interested in seeing the action and dimensions.

Thanks :)

Yeah, I know the ones your talking about, not sure if they can be bought for a little as 25-30 dollars though.

This may be something similar to what your talking about:

http://www.bryanandac.com/images/JDobric1.jpg

If not, I was cruising Luty's website and I came across this link:

http://www.homebuiltfirearms.com/

Take a look at the single shot .22 that he made, you may be able to downscale it even furthur. I may be time for me to crack out the South Bend mill again!:)

Your description fits in part a swiss made self defence device which fired "gas cylinders" loaded with OC irritant, but these "guns" were much more costly and where a total flop commercially. They were briefly sold by the Rhöm company in Germany.

These devices were the size of a pack of cigarettes, the double action trigger was in the middle of the device and the two "barrels" arranged over and under the trigger.

The only other "gun" I know of which fired "gas cylinders" was a russian self defence device which looked just like a pistol grip with no barrel like the Heckler & Koch Air Force emergency signaling device.

I think something similar would be a simple zip gun. Certainly the design can be adapted to whatever you like.

Pipe Cannon http://www.instructables.com/id/EVBAU73EYFEV2Z666F/

Zip Gun design http://www.thehomegunsmith.com/pdf/ZipGun.pdf

Zip Gun general info http://en.wikipedia.org/wiki/Zip_gun

some years ago in the uk [and probably europe] there was a keyfob available that could be loaded with what us brits know as a brocock cartridge[small brass cartridge based on .38 special that holds a charge of compressed air and a pellet/slug in a threaded cap on the front]. These are no longer available in the uk due to the ban on brocock weapons. Interestingly they were illegal even before the ban as they were over the limet of 6ft/lb me for air pistols.

This may be something similar to what your talking about:

http://www.bryanandac.com/images/JDobric1.jpg

I wasn't really on about that, but that really is a stunning little piece. The more I look at it, the more I like its simplicity and elegance. I would be interested to know how the whole chamber and barrel segment was joined, as it looks like a single piece.

some years ago in the uk [and probably europe] there was a keyfob available that could be loaded with what us brits know as a brocock cartridge[small brass cartridge based on .38 special that holds a charge of compressed air and a pellet/slug in a threaded cap on the front]. These are no longer available in the uk due to the ban on brocock weapons. Interestingly they were illegal even before the ban as they were over the limet of 6ft/lb me for air pistols.

That certainly sounds interesting! I'm suprised I've never heard of these, as I was a big fan of air cartridge back in the day!

I've actually found a short article on what I'm talking about, only it shows a very small picture. Sounds simple in theory, it's just the firing mechanism I can't work out practically. .22 rimfire also sounds like a much more sensible, albeit less effective option. http://www.cnn.com/SPECIALS/cold.war/experience/spies/spy.gadgets/weapons/keychain.guns.html

I think that they were actually manufactured by brocock themselves but don't quote me on that one. They were certainly available in the midlands albeit for a short time due to their power.

This was one of the underlying reasons for the brocock ban, in that it was very simple to up the power on almost any air cartridge weapon by sealing the deliberate gap between the cylinder/chamber and the barrel.

I have one such a thing, it makes single shot and fits on keyring. Size can be compared with laser pointer, it's aimed for close combat distances less that 2m. I can make a photo if anyone is interested.
I also have a "russian self defence device" - very good thing - a person who received a charge will fall down immediately and be !SILENT! for half an hour at least.

I have one such a thing, it makes single shot and fits on keyring. Size can be compared with laser pointer, it's aimed for close combat distances less that 2m. I can make a photo if anyone is interested.
I also have a "russian self defence device" - very good thing - a person who received a charge will fall down immediately and be !SILENT! for half an hour at least.

I would very much like to see that :) Detailed photographs, and maybe even a drawing with measurements would be great!

Here. It's originally made from some kind of tripmine from possibly world war I, there is a date "1936" on its side. Interesting isnt it? And when it was first disassembled (after it was digged out) the power of spring was enough to damage my hand with a hammer jumped out.
Well, going to how it works. The hammer is pressed inside of a long thing. Note small holes on its side. Then it's fixed by two small pieces inserted into holes (not present on photo because i cant find them), and finally all this stuff is inserted into main embodiment, which blocks the pieces.
Operation is very simple: first the safety pin is removed then you pull out the ring, long thing will go down releasing "pieces" and hammer strikes the cap.
I have used this device with a bullet from .22LR cartridge, pressed inside. And some amount of gunpowder. It can shoot out 20mm wood from 2m.
I hope you will understand this explanation. Ask if something...

Maybe if you upload the images onto photobucket, you won't be taking up valuable space, and it will be easier for everyone to see them.

Sure, no problem.

http://img365.imageshack.us/img365/5139/image14lu1.th.jpg (http://img365.imageshack.us/my.php?image=image14lu1.jpg)

http://img365.imageshack.us/img365/9665/image13qn1.th.jpg (http://img365.imageshack.us/my.php?image=image13qn1.jpg)

http://img201.imageshack.us/img201/3154/image15ht9.th.jpg (http://img201.imageshack.us/my.php?image=image15ht9.jpg)

Can you see them now? Should be 3 images.

It looks like the tripwire firing mechanism for a jumping mine.

In book "Pipes, Zips and Pens" by Truby also had image one-shot pen gun made from grenade fuze This wey-well design for disposable one- shot hand gun.

the little "pistol" with the knob on the back is still avaliable.turning the knob in the back releases the ait and fires a .177 pellet..check out bbmachinegun.com.the maker has a post on the forum