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Airsoft Shotgun

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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Airsoft Shotgun

Unread postAuthor: PVC Arsenal 17 » Mon Jun 30, 2008 4:22 pm

I built a simple little gun to make use of the "shells" I mentioned in this thread.

It has a 1" x 12" PVC stock/chamber. The main valve is just a modded sprinkler and the trigger is a blowgun.

To be able to use the shells, I glued a 1" x 1/2" bushing into a 1" male adapter. This piece is the heart of the shotgun. It connect to the sprinkler and provides a socket (1/2") to plug the shells into.

The glue is still curing... but here is a picture. I also took a video of the shells being fired with a different sprinkler valve gun.

Image

Image The cotton looks cool when you fire the gun. The bb's go damn far and have a wide spread with excellent velocity.

Image

Reloading the shells is a breeze. You just pop off one cap and stick a cotton ball in the end of the tube. Replace that cap and take off the other one. Fill the tube with bb's leaving about a 1/2" of tube empty. Stick another cotton ball in and put that cap back on. You have to take the caps off when you're shooting but I like to keep them on while I'm carrying the shells just to make sure nothing falls out. They are very secure though without the caps.
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Unread postAuthor: Spuddin » Mon Jun 30, 2008 4:28 pm

nifty lil gun, the reloadable shells are cool. first of its kind that ive seen.
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Unread postAuthor: f.c » Mon Jun 30, 2008 7:10 pm

the chamber to barrel ratio is crazy i bet it has a hell of a lot of recoil.

nice clean build b.t.w
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can i be a sasquatch ?
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Unread postAuthor: pizlo » Mon Jun 30, 2008 7:16 pm

Wow, I bet half the chamber size would give you similar performance.
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Unread postAuthor: Sticky_Tape » Mon Jun 30, 2008 7:22 pm

I made somthing like this before it was made with 3/4'' cpvc and 1.50'' abs dwv I know I know what ever.
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You can tell how awesome a cannon is by the pressure used.
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Unread postAuthor: THUNDERLORD » Mon Jun 30, 2008 7:24 pm

Pretty Schweet cartridges.
In the video there's a section of pipe not shown in the pic?

Instead of cotton, you could try a section of plastic grocery bag.
BTW, Like I replied last night, you might as well try adding a burst disc to the end closest to the sprinkler valve. If nothing else, it might give you more bang. 8)

EDIT: OK, just re-read that it was a different s.v. gun in the video.
How's the one in your post shoot?
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Unread postAuthor: PVC Arsenal 17 » Mon Jun 30, 2008 10:40 pm

Yeah the C:B ratio is crazy. I wanted to give the stock some length. And technically there isn't really a barrel. Having one wouldn't really help much anyway. If anything just make a tighter spread.

There is hardly any recoil since the cotton and bb's aren't of significant mass.

I will try the plastic bags as wadding. The gun still needs to cure, I'll test it tomorrow.

Thanks for the comments!
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Unread postAuthor: PVC Arsenal 17 » Tue Jul 01, 2008 1:10 pm

I tested the gun today and I am extremely disappointed in the sprinkler valve's performance using a blowgun. Up until now, I've only used ball valves to pilot SV's. Instead of getting the usual loud "CRACK", I got more of a dragged out honk. I tried two different blowguns and both worked like crap. I am positive that this sprinkler works properly too.

So it's off to find a better pilot valve that resembles a trigger. Maybe I'll just mod the blowgun...
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Unread postAuthor: Carlman » Tue Jul 01, 2008 1:42 pm

it honks because of your crazy CB ratio aswell lol :D
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Unread postAuthor: PVC Arsenal 17 » Wed Jul 02, 2008 8:10 pm

It never honks using a ball valve though!
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Unread postAuthor: blind909 » Wed Jul 02, 2008 11:12 pm

What do you use as a fill valve(Im assuming its that little silver thinggy at the bottom of your stock), but it doesnt look like a quick connect, shraeder, or presta.
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Unread postAuthor: PVC Arsenal 17 » Wed Jul 02, 2008 11:20 pm

It's a schrader. But a fancy one.
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