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9mm Coaxial airgun

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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9mm Coaxial airgun

Unread postAuthor: Juggernaut12121 » Thu Jul 03, 2014 7:49 am

I've wanted to build a smaller bore airgun for a while, I also wanted it to be more compact although that didn't work to well for me :P . I still like it though
The barrel is a length of aluminum round tube that's 3/8'' in ID (not exactly 9mm but close enough with wadding) and almost 1/2'' in OD by 3' long
Chamber is a 2' section of 1 1/4'' pvc pipe
The piston is a 3/4'' pvc cap filled with hot glue and topped off with a piece of sheet rubber (sorry I don't have a picture)\
I wanted to keep it somewhat small and simple so the pilot valve is a 1/4'' ball valve, and I need to attach a thingy onto the quick adapter on the other end of the ball valve
The backstop is a layer of weather sealing tape
I haven't gotten to really shoot it yet since the ammo is still in the mail, but it seems to work pretty well.
The stock is alright but in retrospect I probably should have used 3/4'' pipe and fittings instead of 1/2'', which I had lying around.
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Attachments
a4.jpg
Gun without stock
a3.jpg
The pilot valve and fill port, the male quick connect is placed at a 45 degree angle down so that air doesn't blast your hand while it's in the stock, and a metal bushing behind the foam backstop
a1.jpg
The thingy I mentioned earlier, it's just a female quick connect and a Schrader valve attached together with a 1/4'' nipple
a2.jpg
The gun placed in the stock, the black thing near the back of the gun is a zip tie used to anchor the back end down, and the male adapter up front is to attach a barrel shroud or similar, and I want to place a red dot sight I have lying around on top of the gun
Whatever the mind can conceive and believe, it can achieve
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Re: 9mm Coaxial airgun

Unread postAuthor: fractal » Thu Jul 03, 2014 4:42 pm

Looks well constructed
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Re: 9mm Coaxial airgun

Unread postAuthor: Juggernaut12121 » Thu Jul 03, 2014 5:03 pm

Thank you :D
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Re: 9mm Coaxial airgun

Unread postAuthor: jackssmirkingrevenge » Sun Jul 06, 2014 7:46 pm

Nice effort! For a small bore personally I would have gone for higher pressure and a smaller chamber volume, you would be amazed at the difference in performance.
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Re: 9mm Coaxial airgun

Unread postAuthor: Juggernaut12121 » Mon Jul 07, 2014 10:05 am

Thanks! I would've made something more high pressure (out of copper or something similar) but I didn't have any way to pressurize it past 100 PSI (I have a floor pump and a small air compressor). Unless I'm missing some sort of technique or something (highly possible for me to be missing important or obvious knowledge)
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Re: 9mm Coaxial airgun

Unread postAuthor: fenrir » Mon Jul 07, 2014 11:05 am

You can make a stirrup pump, or salvage a fridge compressor in order to reach higher pressures.
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Re: 9mm Coaxial airgun

Unread postAuthor: Juggernaut12121 » Mon Jul 07, 2014 2:35 pm

Thanks! I've never heard of a stirrup pump before a few minutes ago, that'll probably be my next project


Edit: after looking a while I've figured out that I just called them something different, but I've never thought of building one
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Re: 9mm Coaxial airgun

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Re: 9mm Coaxial airgun

Unread postAuthor: jackssmirkingrevenge » Mon Jul 07, 2014 8:33 pm

You can buy a floor pump that goes to 260 psi for not much $$$: http://www.amazon.com/Serfas-FMP-500-Bi ... floor+pump

That will more than double your available power...
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Re: 9mm Coaxial airgun

Unread postAuthor: Juggernaut12121 » Thu Jul 17, 2014 4:02 pm

I thought about getting a shock pump for getting higher pressures in future guns, I found one for decently cheap (boasts 400 PSI)
http://www.amazon.com/XLC-High-Pressure ... shock+pump
Although I don't have any experience with them, I don't think they should be too hard to use

Btw JSR your picture and your quote are awesome
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Re: 9mm Coaxial airgun

Unread postAuthor: fenrir » Thu Jul 17, 2014 5:14 pm

Just don't use very large volumes. If you live in the US, I can send you mine for 25 dollars shipped, just PM me.
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