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Coaxial bb gun

This area is for the discussion of BB or airsoft sub machine guns, and or other small arms such as pellets.
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Coaxial bb gun

Unread postAuthor: ckman » Thu Dec 11, 2008 6:10 pm

Okay here is my coaxial bb gun
barrel:2 feet of 1/4 brake line
chamber:1 foot of 3/4 sch 80 pvc
exhaust valve:1/4 ball valve
Operating pressure:100-140 psi
piston:1/2 inch copper end cap wrapped in a little bit of tape with two layers of bike inner tube for the sealing face.

There is a slight leak in the barrel witch I need to fix other than that it is very powerful it can shoot straight through a metal zippo lighter fluid can with a .177 metal bb. from about 40 feet away.


Whoops just posted this in the wrong section could a moderator please move this thank you
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Last edited by ckman on Thu Dec 11, 2008 10:37 pm, edited 3 times in total.
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Unread postAuthor: VH_man » Thu Dec 11, 2008 6:29 pm

Are you sure that leak you were having wasnt the stuff you used to seal your barrel in there?

Otherwise, Nice. any shots of the cannon in its entirety?
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Unread postAuthor: jrrdw » Thu Dec 11, 2008 6:32 pm

You gonna seal that barrel from the inside?
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Unread postAuthor: ckman » Thu Dec 11, 2008 8:19 pm

yeah im sure because I epoxied all the way around and made sure there were no leaks.


Yea im gonna seal the barrel from the inside
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Unread postAuthor: psycix » Fri Dec 12, 2008 6:59 pm

Your epoxy use is... excessive.
Nice gun. Is the barrel perfectly parallel with the chamber?

Kudos on the foot picture though! :D
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Unread postAuthor: ckman » Sat Dec 13, 2008 2:08 am

yeah the barrel is perfectly parallel with the chamber

Oh yeah thx :P
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Unread postAuthor: psycix » Sat Dec 13, 2008 2:22 pm

Okay good.
Any chance of a vid?
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Unread postAuthor: Sticky_Tape » Sat Dec 13, 2008 2:45 pm

I'll dub thee twinkle toe. You gun is ok for a first why not give us a picture of it put together? That SCH 80 looks kind of like steel it is threaded.
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You can tell how awesome a cannon is by the pressure used.
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