A friend of mine who is a former JPL mech engineer was working on an amazing, high pressure golf ball cannon until his city issued him a citation for his smalle

A friend of mine who is a former JPL mech engineer was working on an amazing, high pressure golf ball cannon until his city issued him a citation for his smaller gun. That pretty much ended his foray into pneumatic weapons. Shame, because his gun looked amazing. He even custom built a road case to store it all. Guy is on the spectrum and has ADHD which has resulted in some amazing, but completely over-engineered, work over the years. He engineered his own gluelam support beams in his garage which could lift a car. He rewired his house using all stranded wire, bus bars and crimp connectors and it was all mil-spec.