You've never seen people on
www.spudfiles.comexplode when noobs ask for plans. Just go figure it out,check the spud wiki, the wiki button on spudfiles is at the top right. And also don't copy someones design, have some originality.20+ psi is no joke, let alone 100-400 psi, the standard operating pressure of most homemade guns. At 100 psi with dart ammunitionmy sprinklervalve gun shoots THROUGH 6" solid rocksheet(my wall). And rocksheet is tougher than plywood. Thats atabout 500 fps(chronoed).