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Mitch's All Metal BB Gun

Built a pneumatic cannon? Then post it here! This section is for completed, finished cannons that you have built. Please include pictures and information.
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Mitch's All Metal BB Gun

Unread postAuthor: Mitchza89 » Tue Sep 18, 2007 10:27 pm

Gday guys,

After many months of dicking around, totally broke and just plain lazy, I've finally made my bb gun. This is only the first version of it.

I plan to:

take off that other end cap on the back of the bottom t, so I can place a stock.

Make the ball valve lever into a proper trigger aswell as putting on the piston grip at the end of the valve.

Mount a 300-400psi shock pump.

....and ofcourse, give it a good polish.

It's not the nicest looking gun on here but it's totally air tight, works absolutely perfectly (the first time I pumped it up, it worked like a dream) and it was pretty cheap to make.

I've only tested it at 140psi because the shock pump I bought sh!t itself but holy moly.........even at 140, it's like a bullwhip.

I really take my hat off to Jack on this one, Couldn't have got it working without his advice, not to mention of the other spudders on this site,

Cheers guys.
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Unread postAuthor: blind909 » Tue Sep 18, 2007 10:30 pm

nice, i like it alot, damage pics?
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Unread postAuthor: Mitchza89 » Tue Sep 18, 2007 10:31 pm

Nah not yet mate. I'll get some up when I get the shock pump, so I can really test it out.
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Unread postAuthor: Lentamentalisk » Tue Sep 18, 2007 10:47 pm

what is your barrel size and where did you get it?
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Unread postAuthor: Mitchza89 » Tue Sep 18, 2007 10:49 pm

its a 9/32 brass tube. You can get it from most hobby shops tha sell remote control cars n model ships.
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Unread postAuthor: shud_b_rite » Wed Sep 19, 2007 1:03 am

how did you get it to seal so good? Im currently experimenting with a small brass coaxial piston bb gun and I cant get it to seal well enough around the barrel. And the end of my barrel is like a cookie stencil and it just slices through the neoprene that is keeping it sealed.

Anyway that is a nice gun, the ball valve lever/trigger upgrade sounds like a great idea, you could build it into the stock.
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Unread postAuthor: Mitchza89 » Wed Sep 19, 2007 1:16 am

Jackssmirkingrevenge gave me the idea of sealing the barrel to the chamber. Wrap a real tight roll of masking tape around where the barrel goes into the chamber so it forms a nice tight fitting plug. He suggest glue around the plug to seal against the chamber but I thought I wouldn't have to because I'm using a compression fitting....and whatcha know, it worked perfectly. For the cost it cost to make and the how well it seals, ya just can't go wrong mate.
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Unread postAuthor: Marco321 » Wed Sep 19, 2007 1:18 am

Nice gun, i have been waiting to see her for a while, i love it
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Unread postAuthor: Mitchza89 » Wed Sep 19, 2007 1:21 am

Cheers mate, thanks alot. The way I've been waiting and waiting to build it and the plans I've submitted for it, I thought it would have been a let down ;)
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Unread postAuthor: chaos » Wed Sep 19, 2007 1:49 am

finally she's up and running...

i also have been waiting a while to see this.
mitch, mate you just have to get a vid of this thing working.

it turned out really clean and will definitely look the part with the stock and a polish.

but yes as i said, it is a must to get some damage pics and videos of it in action.

again, nice work
~Case
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Unread postAuthor: jackssmirkingrevenge » Wed Sep 19, 2007 2:20 am

glad to be of help :) now get that shock pump and show us what it can do :D
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Unread postAuthor: Mitchza89 » Wed Sep 19, 2007 2:23 am

Ah mate I'm really p'o'ed that the one I have has crapped itself. What sort of pump do you have anyway Jack?
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Unread postAuthor: jackssmirkingrevenge » Wed Sep 19, 2007 2:51 am

Mitchza89 wrote:What sort of pump do you have anyway Jack?


This is the model I have: GS02. I suggest you get one with a gauge that reads to 400 psi as I overpumped mine so many times I've knackered the gauge, it reads 40-50 psi when empty hehe.

Im currently experimenting with a small brass coaxial piston bb gun and I cant get it to seal well enough around the barrel. And the end of my barrel is like a cookie stencil and it just slices through the neoprene that is keeping it sealed


One solution is to use a bit of rubber tubing as a seal on the barrel itself, removing the need for a seal on the piston. I use this system on my small calibre minis as well as the pneumatic cartridge prototype which is essentially a mini with a short barrel.

Here's what the bits look like:

Image

and the relevant drawing:

Image
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Unread postAuthor: Mitchza89 » Wed Sep 19, 2007 2:58 am

Ah yeah, Thats a good looking pump. I reckon I'll get the GS-01. I'm so broke at the moment but there is a pump that I'm looking at, it goes to 400psi and it's only 15 bucks more so I reckon I'll grab it if I can.

One more question, with your pump.....are you able to push the plunger down at any speed and it will still fill up your chamber? With the pump I had, you had to ram it down really hard n fast otherwise it wouldn't pump... Or are all shock pumps like mine?

Thanks mate.
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Unread postAuthor: jackssmirkingrevenge » Wed Sep 19, 2007 3:09 am

You need a bit of speed to pump, proportional to how worn your seals are - if it's too much, then it's usually only a couple of o-rings that have to be changed, no biggie
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