converting a 25mm pvc pneumatic to shoot bb pellets

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spatout
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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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SubsonicSpud
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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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spatout
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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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inonickname
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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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SubsonicSpud
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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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