This design worked pretty good. It shoots alot of bbs in a real short time.
if you used a longer barrel it would probably be more acurate but i was going for portability and rate of fire so i made a pistol instead of a rifle.
it was a lot of fun I have seen others but this one I designed myself and wanted to share it.
I used a block of wood an old pump action bb pistol, a paintball hopper, an air gun, Hot glue and some aluminum from a street sign. (I didn't steal it) Oh and a little JBWELD
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Signing UpStep 1Barel tracing
I took a peice of 1x6 and just cut off a peice about a foot long. I found that I didn't need that much.
Lay the barrel on the wood and get about an inch in and trace the barrel so you know where to draw the circle for the vortex.
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P.S. you should submit it to http://www.spudfiles.com/
They have an entire section devoted to bbmgs
not only is it genius, but its cheap and effective
this is awesome 5 star =]