So this is version 1.3, so how about some history...
v1.1, had piston issues along with ignition and fueling; only fired with a burst disk

v1.2, Meter pipe not shown, but it worked with a syringe and was low powered

And the best version to date: v1.3
Specifications
- 6" steel chamber
- 1/2" porting, isolated, vented pilot
- piezo electric ignitor
- interchangeable cam-lock barrels


Meter:

Piston:

Tell me what you think, Ive put a lot of work into it and hope y'all like it!
~LnL~