In keeping with same I'd barrel throughout.
Could design be as in pic that follows.
Holes in barrel with sleeve over holes.

Sorry last didn't attach pic

Super cool.
See the labor in build.
I like it.
Another note or idea.
Always thought is it possible to have a two stage pressure piston off the one stroke.

Pickle me grand mother. "big belly laugh". Dunno about ya tech thing variables golf balls. Yeah 750 mtr range... I av golfer, smak em 240 mtrs. When I get onto em , Its "Anzac" on the tee. One minute of silence, that is.... Gahahaha. I'd Rekon I give big red, prob 5 mins of silence after seeing it i...

My proof of concept was a smashing success but I put it on hold to work on the BBV. Sounds interesting. I think I get it. Sorta like a blowback but vertical. The bb when in barrel causes back pressure for the diaphragm to close and grab a bb from horizontal feeder. When bb leaves barrel,no back pre...

keks2033 wrote: ↑

Sat May 23, 2020 11:53 am

OK.
So you saying too much going on in valve?.
Ditch the chamber feed, one way valve feed by nozzle / piston retraction.
Control with a valve that I dunno?. make it 2 position 4 way. Normal open.
Feed chamber be open then block.
Feed Piston, open then exhaust.

Hi. New to forum. Haha... Fresh meat... Spent bit time reviewing stuff. Sorta broken links, referring to Xyz. "blow forward, pics no longer valid sorta been challenge. Any how been interesting. Maybe wat came up with already been done. Any how have come up with a semi auto valve concept. Based on ma...

Came across this also.
It's a kokusai? "crimebuster "
Any ideas how this works.
Somehow it's manual operated from gear box.

6 years on from this post.
Interesting if look on Web.
Development of hpa.
Semi nerf, by enthusiast.
I don't play, use.
Found interesting the system and adaption
People come up with.

Have you checked out mancraft hpa engines.