After a lot of back and forth, I finally got it to work this summer. For the compressed air buffer, I used a fire extinguisher which I fill with air from a compressor. I have put the valve in the bottom of the bottle. Trigger is a rebuilt sprinkler valve. As a projectile i use golf balls that have been slightly modified so that they become a little heavier. Now it’s just fun to shoot up mounts for antennas in the trees.
