I’m looking for tubing/pipe that I can purchase. For making a bigger air tube for my Leshiy. Any help is appreciated thanks, Steve
The tubes are generally engineered to have a safety factor of around 3.5:1. Meaning its designed to burst @ around 3.5 x the pressure it is intended to retain. Any material can be used provided its designed within said specs. Most common materials are High grade aluminum 2024-t3, or titanium, although many manufacturers and older rifles still use steel / chromoly.
So unless you're familiar with calculating high pressure vessel walls that'll withstand 3k-4k psi or whatever your fill pressure is, I would inquire with someone that is.