Look into some lexan, scroll to the bottom and look it up.
Copy and pasted
An Aardvark signature, the addition of a viewport that let the user watch the bolt movement in a high-pressure chamber was unique. Aardvark realized if they took the shot chamber sleeveand sealed offtheoutsidewith o-rings, there would be no reason they couldn’t cut off the body and get a view of the bolt. The only problem would be to find a materialdurableenough to handle the constant fluctuation of pressure in the shot chamber.
“I had this… well it’s sort of like a bicycle tire pump that goes up to super high pressures. I got a couple different materialsout and tested. Acrylic, I discovered, would blow up and shatter into horrible jagged pieces at about 1200 PSI. Lexan cracked and began leaking at 2200 PSI. Obviously I went with lexan for a longer lifespan. I would NOT recommend making a replacementtubeout of acrylic.” -Greg Duncan
Lexan is a material used in some airplane cockpits. It’s also marketed as being bullet-resistant. Of course, this has to be tested as well.
“Guns are illegal in Canada, so that made the bullet testing a little harder. Despite this, we had a friend with .22 pistol who agreed to help us out. We went down to my basement and set up a Matrix with a Lexan tube and a blue bolt inside. He carefully took aim and squeezed off two shots. The first shot made a dent in the tube. The second one penetrated and ended up lodged in the lexan, touching the blue bolt. Not too bad.” -Greg Duncan
Despite lexan being a very rugged and durable material, it will eventually go bad. Every time the Matrix is fired, the shot chamber is emptied and refilled with air, fluctuating between 0 and ~225 PSI very rapidly. Every time this happens, the lexan expands and contracts, like breathing. Over time, this causes stress fractures and, eventually, leaks. The Tequilashad a fairly largeviewablearea of exposed lexan. The more exposed area there is, the less support for the expansion and contraction of material. When Greg realized the limitations of the lexan, he shrunk down the size of the window for the TequilaSunrises. This givesthe tube more support and lets it last longer.