Word of warning for hybrids, always do preliminary testing behind a heavy shield and, if possible, in the middle of nowhere. Piston's are tricky to get right. Mr.Crowley had issues with his opening too early. Do you have a design in mind? If so can you draw up a sketch?

Thank you for the advise ...

pneumaticcannons wrote:looking good! I like It
Have you considered syringe metering? normal metering would ruin the looks.

Thanks for liking,actualy this one only experiment for me.I'm working for my 2nd project.I'm planning to built a piston hybrid with metered butane & semi auto bridge loader.

Hi,this is my first ever built.I made it from a MP5 toy gun.and these are some materials I used.
3' of 1/2" pvc pipe for barrel.
2' of 2" pvc for chamber.
2" to 1/2" pvc reducer.
battery operated kitchen igniter.
1/2" T joint for scope.
laser pointer.
epoxy,black paint & some wire.
By the way ...