I highly doubt this can move a paintball far, but I'm going to try mini-propane injection... (Hopefully)...
If this doesn't work correctly, it's already pictured with an airsoft barrel that should work fine... This gun may just meet the trashcan though


I still need to fix in an igniter... My last igniter was ruined whilst I was trying to glue it in... I made the mistake of pouring adhesive into the internals of the igniter, so it was ruined, and I had to chisel the remains of it out of the gun...
Edit: Gun update
Made airsoft barrel... 5/16th inch brake line hot glued\tefloned into a 1/2" hole....

The Schrader is at my other house... Thinking about using a butane venturi for fueling...