I just need the kind of PETG where you can blow the dart down the barrel, and it's still air tight so it wont drop out of your gun. That's the kind of PETG I have on my Max Shot. What OD and ID is that kind supposed to be? Anyone know?
To do the breech, all you need to do is cut a rectangle in the 1" PVC, put the foam sheet in there, make sure it fits, cut a rectangle in that with a knife. Load the dart in there, then put the 1/2" PVC in there?