rainbird 1", tennis ball projectile, 100psi max, bike pump to pressurize,most of the time, but also have 15lb CO2 bottle, Noise? i wanted to make this launcher cause ammo is currently overpriced and 22lr is hard to find.

i already have 36" barrel and was thinking of using 4" pvc for pressure side

the HGDT/GGDT is for windows, wont work on my mac.. whats a better ratio 2.5:1 or 3:1 i already have my barrel length just need