I am making a airsoft 'shotgun,' just a bunch of BBs with a foam plug on either end for ammo. Does anyone see any negatives for using something like feed corn for ammo? I do not intend to aim directly at anyone, I hope to arc the rounds like a mortar. 50 pounds sacks are about $20 at Tractor Supply.

Sorry for the late reply. I have only gone up to 70 psi so far. Sadly, I think I enjoyed building it more than I enjoy shooting it.

Thanks for the replies, everyone.
how'd u stick the blowgun tho?
I just used one hose clamp. I had two, but the other one prevented the blowgun's lever from going all the way down.
Have you cansitered putting a scope on it?
It isn't nearly accurate enough to require a scope, but it would look ...

I do shoot left-handed It is comfortable for me.

It's pretty comfortable, actually. I like being able to look straight down the barrel.

I saw this cannon on Burntlatke, and decided I wanted something similiar:
http://www.burntlatke.com/jpg600/nw-aaron-rifle.jpg

The chamber is made of 2" sch 40, and uses two couplings, one repair coupling, two 45* elbows, and two 3/4" male adapters. The entire chamber is double walled, so it ...

Can a mod please delete this thread? I figured everything out, and don't want to clutter this forum with useless threads.

cash68 wrote:So it's the same design, but with different parts.

Yes, if that is how you see it. I took out everything about the cannon, I just need some help with the questions I originally posted.

I don't know what size his barrel or chamber are, or what fittings he used to make it.

Hello, let me start off by saying that I have searched for these answers, but I must be using the wrong search terms.

I have a couple questions:

I followed this how-to guide to modify my sprinkler valve:
http://www.spudfiles.com/forums/modding-a-sprinkler-valve-t305.html
I drilled the 1/2" hole ...