Burst disk would be the ultimate valve where do you get them though? Like to break at 120psi would be sweet.

The next thing I want to launch and video tape is glowsticks. It should look like tracer ammo.

I just made a spud gun (cannon) it was a bead seater. Now it is a cannon! it has a 75" long barrel 2" diameter made with schedule 80 ipex with a 2" butterfly valve and it packs a punch. The chamber is 12" in diameter and 12" long. I am new to this form so I hope this works and you like the spud gun....

I found for a 2" air cannon I rip the blue foam board to pieces. The best method of shooting a big dart is to use paper towel and duct tape. Fold the paper towel in half then in half again wrap it around the dart till it makes a good gas seal and slides easily then duct tape it on there then use the...