SpudFiles

Hmm, do you guys have an idea how to add a piston? please in diagram, (thanks for all your help)

Maybe like this:

Yup that should do it.

That's a good idea, but i've made my own disign, with you're idea. but i have some questions.. becouse, when i want to reload after i shot, how does the piston go in his rest position? couse when i've shot, the piston goes back, and the compressed air can flow. but if i want to refill it, i guess the piston stays back and the air goes directly to the barrel and can not be compressed.. how can i solve this problem?
here is my disign:

a barrel sealing piston is filled via the pilot side (behind of the piston) so if you refill it pushes it forward thus sealing barrel.

but i refill it in the stock

Is this a good alternative then?

just keep your design before this last one and fill from the pilot

If you are refilling through the stock, you should put a spring behind the piston. This will cause it to reseal on the barrel surface.

Oh, and I think I'm missing something on that alternative design. Can you explain it?

Your alternative is kinda weird
You will need to use o-rings and make sure you will have a 100% seal.
It will be hard.

Use a normal piston
Just fill it from the pilot side and not from the stock.

Lorem ipsum dolor sit amet, consectetur adipiscing elit. Cras nec placerat erat. Vivamus dapibus egestas nunc, at eleifend neque. Suspendisse potenti. Sed dictum lacus eu nisl pretium vehicula. Ut faucibus hendrerit nisi. Integer ultricies orci eu ultrices malesuada. Fusce id mauris risus. Suspendisse finibus ligula et nisl rutrum efficitur. Vestibulum posuere erat pellentesque ornare venenatis. Integer commodo fermentum tortor in pharetra. Proin scelerisque consectetur posuere. Vestibulum molestie augue ac nibh feugiat scelerisque. Sed aliquet a nunc in mattis.

hubb017 wrote: Oh, and I think I'm missing something on that alternative design. Can you explain it?

Well, the alternative design is that the pressure is on the piston, and when you pull (the rod that's hold the piston), the piston goes backward and the air can flow very quickly to the barrel. So, there is a lot of tension on the pulling rod that holds the piston.

But i've already make the stock before i started this topic. So i have to choose the best alternative. And what if i choose my first piston disign and i get a spring behind it, can the piston go backward if i fire it?

Jack_Hogg wrote: And what if i choose my first piston disign and i get a spring behind it, can the piston go backward if i fire it?

If you have a nice big pilot valve and dont use a really strong spring the piston will move back easily and the spring should serve as a good bumper aswell

Alright, i'll do that. Thanks for all for your help people;)
I really appreciated it.


Topic can be closed.

i'm making a gun with the same design but I thought to place the piston were now the elbow is that forms a V
it decreases the chamber volume but makes it easier to put a valve that opens the pilot chamber