Get a tube that fits the bbs with a hole small enough that bbs won't fall out and connect it directly under the barrel. When the air goes out the barrel and blows over the magazine with the bbs in it, it will suck the bbs into the barrel and shoot them out.

Yeah I've used fittings mis-glued like that up to 150 psi. The epoxy was even overkill.

I have never seen sch40 abs pipe that was not cellular core. Besides I've seen someone who has pressure tested 2" abs up to 250 psi.

Why not ABS? I've gone up to 160 psi on that pipe. Also the duck tape is the stock with padding, but yeah i could use a barrel support.

Hey everyone, this is my second cannon and it is awesome. It uses a modified sprinkler valve as the main valve and is a repeater. I can get about 3 powerful shots every time I pump it up. I messed up my first barrel and couldn't go to home depot to get another, so I put a 3/4" cpvc pipe in a 1" pvc ...

Yeah i guess I could have picked a more flexible hose I was just worried about it bursting.

With the blow gun there is a delay of 1 second from when I pull it to when it actually fires. With the shraeder it would be like 4. Besides the blowgun is nicer to pull.

Actually it would have been cheaper. I figured the dual burst disks would have had a higher flow at a higher velocity than a sprinkler valve. And we wanted to test the idea.

First of all, the hose is extremely thick. If I made it any shorter it would probably bend the barrel before the hose when I tried to raise it. Second of all, we didn't really write anything down on paper or try to find the best design; we just went with it. We knew we needed to put the barrel up fr...

This is my first post and my third air cannon. My friend and I made this for a history project while we were studying the civil war. Yes, our teacher was that awesome. Anyway, it has a 46 inch, 1.25 inch barrel and a 2 inch by 44 inch air chamber. We also can raise and lower the barrel because we us...