My version of Keychain Pen gun

Miniature guns are novelty custom, unique, and sometime downright crude! Common construction materials often include pill bottles or pens. Show us your work!
User avatar
jor2daje
Specialist 4
Specialist 4
Posts: 418
Joined: Sun Oct 05, 2008 9:41 pm
Location: Southern California

Sat Jul 04, 2009 4:06 am

I saw Jook's keychian gun and decided I needed one too. I had pipe left over from my brass pen gun so I decided to build it out of that. Its nothing to special 2.5" long about 8mm wide with a 3mm barrel. I built another firing cap similar to the one on my larger pen gun.

Shortly after building it I looked at another pen gun and saw this that JSR posted and decided to try my hand at building a small pump. It was surprisingly easy about an hour at the drill press and I had a floating oring piston that works great in my 8mm brass tubing. Im not sure exactly what pressure it can achieve but same gun firing same ammo penetrates much more using my pump as apose to a bike pump.

I normally fill the gun with about ten pumps from my small pumps, after that the power increase isnt significant enough to warrant more effort.

No damage pics right now but I got a nail to go through both sides of a coke can.
Attachments
floating oring piston and pump shaft
floating oring piston and pump shaft
the pump and gun
the pump and gun
how I hold it to fire it
how I hold it to fire it
gun with firing cap removed for filling
gun with firing cap removed for filling
the whole gun with firing cap
the whole gun with firing cap
Last edited by jor2daje on Sat Jul 04, 2009 4:17 am, edited 1 time in total.
User avatar
inonickname
First Sergeant 4
First Sergeant 4
Posts: 2606
Joined: Sun Dec 07, 2008 3:27 am

Sat Jul 04, 2009 4:12 am

Nice! I never really got the hang of building penguns reliably..

How about a keychain/keyring epoxied to it? A good source is cheap rubber keychain additions sold for charity. You help sick people, and get a keychain!

Good job, what's the stroke of the pump? With info like that we could give rough estimates of pressure.
PimpAssasinG wrote:no im strong but you are a fat gay mother sucker that gets raped by black man for fun
User avatar
Technician1002
Captain
Captain
Posts: 5189
Joined: Sat Apr 04, 2009 11:10 am

Sat Jul 04, 2009 10:17 am

Very nice.. Well done. Looks like something 007 would carry.
:wav:
User avatar
twizi
Corporal
Corporal
Posts: 511
Joined: Thu Nov 27, 2008 9:04 pm
Location: up yours

Sat Jul 04, 2009 12:21 pm

very well done
btw you should make ahow to on the pump
dont play with airsofter with 1000$ gun and play with a 5 dollar pair of glasses
User avatar
qwerty
Corporal 2
Corporal 2
Posts: 678
Joined: Sun Apr 12, 2009 2:16 am

Sat Jul 04, 2009 1:00 pm

what did you use to seal the barrel on the chamber ,epoxy putty?
I visit occasionally to make unrelated posts.
User avatar
jor2daje
Specialist 4
Specialist 4
Posts: 418
Joined: Sun Oct 05, 2008 9:41 pm
Location: Southern California

Sat Jul 04, 2009 8:58 pm

Everything except for the schrader is soldered together, I epoxied the schrader becuase I would have melted the piston if i tried to solder it.
User avatar
theBOOM
Specialist 3
Specialist 3
Posts: 374
Joined: Wed Jun 03, 2009 10:49 pm
Location: San Antonio, TX

Sat Jul 04, 2009 9:14 pm

How hard was it to build the shock pump? :?:
User avatar
jackssmirkingrevenge
Five Star General
Five Star General
Posts: 25798
Joined: Thu Mar 15, 2007 11:28 pm
Has thanked: 111 times
Been thanked: 68 times

Donating Members

Sun Jul 05, 2009 4:56 am

very nice, a lick of paint and you have yourself a "cigarette gun" :)

good work on the pump too, been wanting to build one myself, though now I have the option of 800 psi fills from my paintball tank. I don't think I'd trust a schrader past that pressure anyway.
User avatar
MountainousDew
Specialist 2
Specialist 2
Posts: 230
Joined: Tue Apr 14, 2009 6:06 pm

Sun Jul 05, 2009 1:57 pm

Good job mate! (I'm unfortunately not Australian)

Do you think you could take a picture from the barrel side(at the barrel)?
<a href="http://s709.photobucket.com/albums/ww95 ... =MDSig.jpg" target="_blank"><img src="http://i709.photobucket.com/albums/ww95 ... /MDSig.jpg" border="0" alt="Photobucket"></a>
User avatar
jook13
Specialist 4
Specialist 4
Posts: 434
Joined: Mon Jan 21, 2008 10:39 pm
Location: Prescott Arizona

Sun Jul 05, 2009 2:06 pm

I love this! looks much nicer than my keychain gun. Great work on the pump as well. I made a pump that worked, but too well. I had the issue of getting past the crack pressure of my schrader, so it didnt fill very fast. I like my shock pump anyways.
I have the option of 800 psi fills from my paintball tank. I don't think I'd trust a schrader past that pressure anyway.
I remember gipetto testing a schrader up to 10,000 psi and it showed no signs of letting up. I would worry about the epoxy more than anything at those pressures.
I like to play blackjack. I'm not addicted to gambling, I'm addicted to sitting in a semi-circle.
User avatar
jackssmirkingrevenge
Five Star General
Five Star General
Posts: 25798
Joined: Thu Mar 15, 2007 11:28 pm
Has thanked: 111 times
Been thanked: 68 times

Donating Members

Mon Jul 06, 2009 1:15 pm

jook13 wrote:I remember gipetto testing a schrader up to 10,000 psi and it showed no signs of letting up. I would worry about the epoxy more than anything at those pressures.
I seem to have missed this particular snippet of info :shock: well technically I have a maximum of 4,500 psi available in my SCUBA tank :D

I wouldn't worry about epoxy as long as there's enough of it. Remember, even air is technically "bulletproof armor" if you put enough of it between you and the bullet ;)

Back to the subjecto f this thread, seriously it's begging to be painted half white, half brick orange ;)
User avatar
Gippeto
First Sergeant 3
First Sergeant 3
Posts: 2491
Joined: Sat Jan 19, 2008 10:14 am
Location: The Great White North...Canada eh!
Has thanked: 1 time
Been thanked: 6 times

Donating Members

Mon Jul 06, 2009 1:53 pm

Setting the record straight, the valve core of the schrader (the sealing face to be specific) was destroyed by the 10000psi test. However, it did not leak.

Replacing the valve core brought it back to "good as new".

Gotta go with Jack on this one. It does look like some sort of James Bond'ish cigarette assassin weapon. 8)
"It could be that the purpose of your life is to serve as a warning to others" – unknown

Liberalism is a mental disorder, reality is it's cure.
User avatar
spudtyrrant
Corporal
Corporal
Posts: 550
Joined: Fri Jan 02, 2009 6:10 pm

Mon Jul 06, 2009 1:55 pm

shoot it with your tongue lol
User avatar
theBOOM
Specialist 3
Specialist 3
Posts: 374
Joined: Wed Jun 03, 2009 10:49 pm
Location: San Antonio, TX

Sat Aug 15, 2009 1:41 am

Maybe a little how to on the mini pump?
And btw nice gun, has it been painted yet ? Any damage pics or videos anytime soon?
User avatar
john bunsenburner
Sergeant 5
Sergeant 5
Posts: 1446
Joined: Sun Oct 19, 2008 5:13 am

Sat Aug 15, 2009 2:45 am

I don't see why two people need to ask for how to's if there is already one (that is very good) on pumps, and the pump above is so darn simple you should be able to build it from having a few looks at the pics.

Otherwise I ditto on the cigarret look and recomend some one makes a ciggar gun some time soon.
Could you give us a rough estimate of pressure and maybe even a video of a shot seeing as how performance is hard to estimate on minis, though really performance isn't the main goal, or achievement in one.

Anyway good job, very clean and simple build, one of the nicer penguns up here.

Oh and by the way, shrader valves are fairly big in mini's there needs to be a smaller solution found for smaller minis, and for small minis with larger chambers and barrels. A shrader core would solve the problem(you screw it into a small, threaded hole in the back of the gun), but i can't think of much else.
"Did you ever stop to think that out of the seven deadly sins envy is the only one which doesn't give the sinner even momentary pleasure"-George Will
Post Reply