There is a piston, I'll post that it is solid billet steel. Concept is the same in terms of piston and sears. As far as the cylinder cap and breach and hop up I may not be able to share.
It may be patentable and if I make it public I loose that option. Of course I would not patent anything until I see if it actually works. Thus details about the secret sauce will be few.
Here is the piston, It it turned from solid 12L14 steel. It has some real mass. Of course about now people are thinking to themselves "airsoft pistons are light". Yes, yes they are. Match air rifles actually have piston head weights. Since this straddles the line between airsoft and air rifle it will require a heavy piston.
Of course I have to actually fire one to know for sure. On paper it makes sense. We'll see about real life though. :-/
Yes this to has half a dozen design changes as well still to come. This is v1, I am up to V1.6. Damn this is spendy....
I should have cleaned it first ha ha.
The fiber filled rubber pad is just laying on there for illustration, it gets mounted with a specific glue.
O-ring is a Millitray spec Viton Duro 75 unit. Strong, tough and has ability to withstand high temperatures. BMW uses these in the VANOS system due to toughness. It is close to 6mm wide.