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Small Airsoft Coaxial Pistol

Built a pneumatic cannon? Then post it here! This section is for completed, finished cannons that you have built. Please include pictures and information.
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Small Airsoft Coaxial Pistol

Unread postAuthor: CrashTestDummy II » Tue Jan 13, 2009 7:35 pm

I just finished this recently, and it's a bunch of fun to plink around with in my yard. This is also my first (working) coaxial. :D

The chamber is made from 3/4" pvc, and the barrel is a 12" long piece of stainless steel pipe. I'm not sure of the exact diameter of the barrel. I just went into Ace with a couple of airsoft BBs and looked for the best fitting pipe :roll: . But the fit is pretty good. Just enough for the BB to take a second or so to roll down the tube when the piston is sealing the breech end of the barrel.

The piston is made from hot-glue, which was cast into a section of 3/4" pvc for the mold. The sealing face is a piece of neoprene, glued to the front of the piston.

The highest pressure that I've taken it up to is about 145-150psi. The coupler on the front of the gun looked a little suspicious to me. I got it at Ace hardware, in a bin that said that the couplers were pressure rated, but the plug doesn't fully fit into it, and it looked a little short in general, so I think it might be DWV. :? Anyways, here are some pictures...


<a href="http://i119.photobucket.com/albums/o139/jpotts90/Overview.jpg"><img src="http://i119.photobucket.com/albums/o139/jpotts90/Overview.jpg" height="200" alt="Overview next to a ruler"></a> <a href="http://i119.photobucket.com/albums/o139/jpotts90/PilotAndFillValves.jpg"><img src="http://i119.photobucket.com/albums/o139/jpotts90/PilotAndFillValves.jpg" height="200" alt="Pilot side"></a> <a href="http://i119.photobucket.com/albums/o139/jpotts90/Muzzle.jpg"><img src="http://i119.photobucket.com/albums/o139/jpotts90/Muzzle.jpg" height="200" alt="Muzzle"></a>

<a href="http://i119.photobucket.com/albums/o139/jpotts90/EntryHole.jpg"><img src="http://i119.photobucket.com/albums/o139/jpotts90/EntryHole.jpg" height="140" alt="Entry Hole"></a> <a href="http://i119.photobucket.com/albums/o139/jpotts90/ExitHole.jpg"><img src="http://i119.photobucket.com/albums/o139/jpotts90/ExitHole.jpg" height="140" alt="Exit Hole"></a>
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Unread postAuthor: jor2daje » Tue Jan 13, 2009 7:49 pm

That looks pretty cool what are you using to keep the barrel centered inside the chamber?
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Unread postAuthor: sputnick » Tue Jan 13, 2009 7:51 pm

Wow that looks like fun, the small guns have always been my favorite!

I have actually been thinking about building something like this, but only if I could find a suitable barrel for pellets, then I would make a whole rifle out of it. Speaking of which, if you extended the line from the T to the blowgun, this would be perfect for a small stock, a sniper air soft gun!

Well, you have inspired me enough to go design one, maybe me and my friend will build one ( we have always talked about making a high powered pellet gun) if we find any time after exams... 10 days!
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Unread postAuthor: Cosmic Muffin » Tue Jan 13, 2009 8:55 pm

nice clean construction, put it on a wood stock. would make it look like gods own creation :P
its deffinately one of the best smaller guns i have seen on this forum
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Unread postAuthor: CrashTestDummy II » Tue Jan 13, 2009 9:54 pm

Thanks for the feedback :)

To keep the barrel centered, I cut off the top of a 3/4" plug and dremeled it down to fit inside the 3/4" pipe. I just cut out sections so it wouldn't restrict flow, and then drilled a hole in the center for the barrel to pass through. The support is epoxied onto the barrel. Sorry if the description is confusing. The support looks like this:

<img src="http://i119.photobucket.com/albums/o139/jpotts90/BarrelSupport.jpg" alt="barrel support">

Thanks again!
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Unread postAuthor: jackssmirkingrevenge » Wed Jan 14, 2009 1:44 am

Very nice :) for small calibre single shot launchers I would normally recommend a smaller chamber and high pressure from a shock/fridge pump, but as a fun little plinker this fits the bill perfectly.
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Unread postAuthor: mark.f » Sun Jan 18, 2009 11:54 am

Very nice. Welcome back CTD, it's good to see you around again. I always liked your work.
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Unread postAuthor: blind909 » Sun Jan 18, 2009 11:17 pm

Nice. I like it, small, portable, and POWERFULL.
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Unread postAuthor: inonickname » Mon Jan 19, 2009 12:38 am

I like it. Have you checked if it's legal for your field (fps)?
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Unread postAuthor: trae08 » Mon Feb 02, 2009 2:12 pm

This is a nice gun, Im a fan of plinkers myself. Great work.
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Unread postAuthor: jonnyboy » Mon Feb 02, 2009 3:22 pm

Do you have to kick up old topics?

inonickname wrote:I like it. Have you checked if it's legal for your field (fps)?


This isn't exactly something I would would call ideal in airsoft especially against aeg's...
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Unread postAuthor: poppamies » Tue Mar 24, 2009 3:01 pm

cool gun! wen i saw that damage piucture i think "i dont want to get shot by that!"
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