I built this cannon for a little under $50 and it is very powerful. For reference to its size the two side pieces of the cannon are made from 5 foot pipes. The barrel is a 3/4in pipe that i shoot ball bearings, glow sticks and one time a roll of pennys (very fun to shoot at a piece of concrete and h...

I have made a couple of cannons so far, but iam planing to make a new one that it actually planned out. If anyone can fill me in on pressure ratings for valves or copper pipe it would be a great help.

Quick Ballistics Lesson On a firearm porting is when you drill holes in the side of the barrel toward the front. These holes releave some of the pressure pushing the projectile and this reduces the amount of gas escaping directly behind it as it exits the barrel making it more accurate. Plus sense a...

A plastic egg half filled with water will fly extremly far as long as you have a wad.

Hey, iam just wondering if any of you have experimented with using porting on your barrels and if it has made any notable effect.