simple co-ax with attached stock

[McCoytheGreater]

video:
it failed btw...

Don't you just hate that?

[Marffy]

hah. thats was a fail. (video) i'd get a better breach. How come it was so weak? it couldn't penetrate the milk jug.

[BigGrib]

My guess is that because the breech split, all the pressure was lost, and therefore the projectile failed to penetrate the milk jug.


You should make a breech out of cast epoxy.

[chinnerz]

My guess is that because the breech split, all the pressure was lost, and therefore the projectile failed to penetrate the milk jug.


You should make a breech out of cast epoxy.

spot on mate

[chinnerz]

video:
it failed btw...

Don't you just hate that?

lol i only just figured out what that was

[Patto]

Really good job man !!

Go the aussies good luck with the new breach ..

[chinnerz]

haha, thanks man.

[Keringkien]

Aussies all they way!! I'm working on my own air rifle now, hopefully get it up to say 300psi and perhaps a 6mm barrel would be handy, if I can get my hands on come copper pellets...anyway mate good luck with your creation, it's holidays for me now so I can get a lot done on this!

Edit: Heading down to Bunnings, do you think they have 20mm threaded piping? I'm guessing thats the way to build my chamber. I'm using MRR's base for a piston valve, sill don't understand these things yet, maybe when I test it with my chamber on I'll work it out. Wish me luck guys.

[chinnerz]

well, i wouldn't suggest starting big, maybe make a small one out of pvc first so you can get all the bugs out of it then make a metal version

[Patto]

how'd you go with your breech ?? did you build a new one yet ??

[chinnerz]

na man i have boon soo busy with school and stuff.... i ended up just using some electrical tape

[Patto]

and how did that go for you ?? is it working again

[chinnerz]

yeah, somewhat.... poor design in my part is starting to manifest... i guess piston rifle number 2 will be better.

[RatedZ4Zoro]

hey great gun,
sorry but this question is a bit off topic but,
i have built a pvc coaxial with a 40mm chamber and cylinder(where piston slides up and down) with a 20mm barrel. My first piston was made of cast hot glue with a 6mm rubber sealing face. my second piston was mae of a 25mm coupling with rubber sealing face bolted on to it. My problem is that the piston seals the barrel, the gun pressurizes but when i try to shoot all the air just escapes out of my blowgun pilot and the piton doesn't even move. Why is this?

[Crna Legija]

how tight is you piston? did you put a equalization port if so try block it up.
if the piston is air tight and you know it make a tiny hole the size of a needle to let air in the chamber
you can also use a bigger pilot valve if it works you need a tighter piston
and try to make piston as light as you can