hey great gun,
sorry but this question is a bit off topic but,
i have built a pvc coaxial with a 40mm chamber and cylinder(where piston slides up and down) with a 20mm barrel. My first piston was made of cast hot glue with a 6mm rubber sealing face. my second piston was mae of a 25mm coupling with ...

hey great gun real clean, i like that.
i am from aus too, sydney to be exact and i was wondering if that sprinkler valve had a guide rod and if it did what did you do with it once you modded it? i recently modded a sprinkler valve and i found that i need back presure on the outlet of the valve for ...

hey nice cannon!!
i was wondering how you get you barrels to stay in the center of your chambers without a support nearer the piston?