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converting a 25mm pvc pneumatic to shoot bb pellets

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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converting a 25mm pvc pneumatic to shoot bb pellets

Unread postAuthor: spatout » Sat May 02, 2009 4:28 am

Hi all
I hope i posted this in the right place.
I made this gun, http://www.instructables.com/id/25MM-Pn ... /?ALLSTEPS
a 25mm pneumatic
it works great, but i am trying to mod it to shoot smaller bb size objects, however im having hassles doing it.
anyone know how to do it?

i tried reducing the size down inside the barrel just a little bit bigger than the bb, it blew my whole reducer out the end of the gun, lol.
any help would be great. cheers
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Unread postAuthor: SubsonicSpud » Sat May 02, 2009 4:41 am

Try again but have a lip on the valve end of the barrel reducer, it cant be forced out the barrel that way. If the reducer is a bush type that slides on the inside of the barrel, you can have a small locking screw going into the bush reducer through the barrel.

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Unread postAuthor: spatout » Sat May 02, 2009 4:55 am

cheers
yeah i duct taped the reducer with a lip so it couldnt be pushed out, but it still got pushed down the barrell somehow, i taped it up some more but thought id check here to see if there is a better way
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Unread postAuthor: inonickname » Sat May 02, 2009 4:59 am

Instead of putting a smaller barrel in, I'd use a sabot or wad. If it fits, grab some empty shotshells.

More rounds per shot, and a larger surface area for the air to force against.
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Unread postAuthor: SubsonicSpud » Sat May 02, 2009 5:21 am

inonickname wrote:Instead of putting a smaller barrel in, I'd use a sabot or wad. If it fits, grab some empty shotshells.

More rounds per shot, and a larger surface area for the air to force against.


That is actually a better idea. I make paper shotgun style shells for smaller ammo on my 25mm copper cannon. you can also fill them with BBs for some buckshot :D

Not sure if they would work on the lower pressure on a PVC gun, as the paper sabot has to be ripped off by the airflow. Would be worth a try :)

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