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Coaxial airsoft rifle design question

Post questions and info about pneumatic (compressed gas) powered cannons here. This includes discussion about valves, pipe types, compressors, alternate gas setups, and anything else relevant.
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Coaxial airsoft rifle design question

Unread postAuthor: achs_xc » Sat Nov 28, 2009 5:33 pm

I want to make an airsoft rifle. I also want to use a coaxial design. I know the barrel needs to be a brake line, but does anyone have a suggestion on what to use as the outer chamber? Is there anything out there that someone has already used?
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Unread postAuthor: VH_man » Sat Nov 28, 2009 5:35 pm

1/2 inch copper pipe. I have used it on multiple occasions. (in fact it is one of my current projects).

Just use epoxy to make your fittings, ect, or solder threaded peices on the end of the copper and use that instead.
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Unread postAuthor: MrCrowley » Sat Nov 28, 2009 6:35 pm

Copper would be the easiest by far. It also looks great as it is very thin, clean looking and allows for a compact and stream-lined light-weight design, compared to something like the bulky galv. steel pipe and fittings which weigh a lot and have huge wall thicknesses.

But you can use anything really, I used pipe from a rudder for a small yacht once :wink:
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Unread postAuthor: inonickname » Sat Nov 28, 2009 9:41 pm

I use aluminum for mine, machine fittings and use epoxy. Threaded solderable fittings can also be used.

Is this for a "shoot at people" airsoft gun or "shoot at random stuff".
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Unread postAuthor: jackssmirkingrevenge » Sun Nov 29, 2009 1:07 am

inonickname wrote:Is this for a "shoot at people" airsoft gun or "shoot at random stuff".


If it's a "shoot at people" design, a coaxial setup is overkill, a multi shot blowgun setup would be a better idea.
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Unread postAuthor: achs_xc » Tue Dec 01, 2009 7:51 pm

What do you mean by a multi shot blowgun setup?
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Unread postAuthor: jackssmirkingrevenge » Tue Dec 01, 2009 11:51 pm

As you can see here, with decent pressure and a long enough barrel, using a blowgun directly as a trigger can happily put a lead pellet through a soup tin.

A coaxial of course has a faster valve and more power potential, but if you want to make something for skirmishing you're better off using a blowgun and fitting a magazine to get multiple shots, as opposed to the single shot you'd get from a coaxial.
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Unread postAuthor: ohspyro89 » Thu Dec 03, 2009 1:49 am

One thing you'd lack, which is very important would be a hop up. Since the start of the barrel is inside the air chamber, there would be no way to use a hopup. You'd lose an incredible amount of range, and to make it up in power would be dangerous.

You could try one near the end of the barrel, but your results may not be desirable.
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