BB gun valves?

[Urban Ninja]

I was just looking at some of the bb guns that companies such as daisy and crossman have to offer. Living in australia, they are illegal here. I need to build my own one. Does anybody here know what kind of valve they use? Is it just a coaxial/piston? Or is it a more exotic design? I am aiming to build one like this: http://www.airgunsbbguns.com/Crosman_76 ... ro760b.htm.
Thanks. .

[)DEMON(]

I will give a link I have given befor,it is very usefull as it shows the special valves that airguns use. http://www.bryanandac.com/new_page_10.htm .That crossman pump action you plan to make,use a piston for it and it will function the same.

[Urban Ninja]

I love that site, it looks like theyve added a few more guns to it. I might use this old coaxial piston setup ive had for ages, it doesnt need to be too powerfull as lon as it can shoot lead balls at over 500 fps Ill be very happy.

[Brian the brain]

Look up my guns if you like airguns.I call ém big bore airguns instead of smallbore cannons.I use higher pressure but a smaller design.There;s a great link to an early airgun in my signature too.You can build a pump pneumatic airgun with spudgun technology.If you build a metal one it can hold a lot more pressure.If you can find one of those hand held CO2 "pumps" for bicycles and a small metal chamber you can make a pretty powerful gun.But remember, the bigger the bore the more force pushes the projectile.Bigger is more powerful.

[noname]

That's the exact same type of BB rifle I have. I can try taking it apart and looking at the valve and how it's triggered because I don't shoot any more (I'm not allowed to cux I accidentally shot out 4 of my neighbors windows).

[Urban Ninja]

That would be great noname, thanks. Is it just my computer or can nobody get on to the http://www.air-power.net website? Thanks a lot Brian the brain.

[Velocity]

No one has been able to get on airpower.net for a while now...

[beebs111]

i think it either got shut down or the guy that maintained it died

[noname]

I took it apart and can't get it back together. I can't figure ouut the valve though.

[daveo]

This guy here makes from scratch some of the nicest air guns I have seen. http://www.glbarnes.com/db.html

[Urban Ninja]

Thanks a lot guys, this helps a lot. I might try with a coaxial for this one and maybe think about making a target rifle, small bore. Only problem is casting slugs for a small barrel. I can cast 1/4 inch with my fishing weight mold, but very small calibers I would have no idea.