Air Cane Coaxial

[kablooie]

This is my first coaxial, it's designed to look like a cane, I could obviously do a lot more to have it really look like a cane, but that gets into concealed weapons and is not worth it. It's also my first ever BB gun. The design is nothing new, but a whole lot of fun. Some features are:
-1/2" chamber about 1.5' long
-1/4" brakeline bb barrel
-Integral silencer (slightly more volume than barrel)
-1/2" epoxy piston with craft foam sealing face (works quite well)
-1/4" ball valve trigger
-All metal (high pressures possible when I replace or epoxy the schrader)

As far as power goes, it is awesome. At 150 psi, it shot a bb through six soda cans from about 2 feet away. It also shoots through top and bottom of two soda cans (more if I upped the pressure from 150). This bb gun is not exactly the model of efficiency, but it's very entertaining (and shiny).

My main issue right now is with the schrader, as it starts to bulge out of the endcap at high pressures, so I am debating whether or not to bite the bullet and buy a threaded schrader, or somehow epoxy this one in. Any advice?

Here are some pics, sorry for the blur.

[THUNDERLORD]

Nice. I really like cane guns, I want to build one sometime.
Good idea to have an integral silencer.
I would suggest buy a metal shrader for a car they're not too expensive.
Also, you could leave the pilot valve more efficient but add a bent tube to the nipple on it.
I don't see why you don't want to make it look more like a cane, I think that would be better than walking around with an air rifle.

[jon_89]

Looks good. I would switch to a blowgun though, but thats just me. Oh by the way I got the same shock pump.

[kablooie]

Thanks for the compliments, I have had no luck with finding a threaded schrader locally, I called Kragen and the guy said they had it, but it turned out by "threaded metal tire valve" he meant the threads on the inlet that every schrader valve I have ever seen have. Uggh. I am not quite sure what you mean by "adding a bent tube to the nipple" (sounds kind of dirty out of context), please explain a little bit more if you don't mind.

I do not want it to look like too much like a cane, because I do not actually walk around with a cane (thank god), so I won't be walking around with it at all. Also, my parents are not too fond of concealed weapons I don't think. I might at some time temporarily make it look like a real cane, but not anytime soon.[/i]

Edit: I missed you post Jon, oops. I would switch to a blowgun, but I have used blowguns before on guns where both sides of it are pressurized, and it leaked like crazy. You're right though, a blowgun would be a nice trigger.

[THUNDERLORD]

By adding a tube to the nipple on your ball valve similar to this
http://www.spudfiles.com/forums/mitchos ... 13839.html
you can have the smaller pilot volume and still have a rounded handle, because the air will flow through the handle like mitchza's design.

You could put copper or some other thinwall pipe in a manual pipe bender to get it rounded if you wanted that cane shape or use two fittings like the one on that gun.

That's all I meant. With the threaded shrader, if you go to an auto parts store sometimes they're in clear packages and you can see the threads.

[kablooie]

Yeah, I like that idea, it would incorporate the best of both worlds. Thanks! I'll change it whenever I get to the hardware store again. For the threaded schrader, I'll look at other autoparts stores in the area (if there are any).

Anyone else have any feedback?

Bump. Anyone else have any thoughts? Another issue I am trying to figure out is how to silence the exhaust, and I would like to stick with the setup I have now, so an alternate fill point won't work for me.