I'm not a paintballer but I do like tinkering and building, so I wanted to share a paintball gun that I designed and built.
It uses a 24VDC solenoid valve I bought from McMaster Carr, and it can shoot at up to 120 PSI. I designed a bolt with it as well that makes it semi-automatic.
I am also currently building a turret for it so that I can control the gun with my mouse.
Check it out here!