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P. 4 Semiauto bb airsoft gun shooting at 280miles/h

Built a BB Machine Gun? Then post it here! This section is for completed, finished cannons that you have built. Please include pictures and information.
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Unread postAuthor: blind909 » Sun Dec 30, 2007 8:57 pm

for airsoft bbs buy a 6.03, or 6.04 mm barrel.
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Unread postAuthor: SPG » Mon Dec 31, 2007 7:01 am

In many ways this is like the Gunpower Stealth range of airguns Airforce Talon in the US of A), except - they're single shot, and they don't move the whole barrel back to tirgger the hammer valve, just a sliding sleeve.

Image

Image

I like it though, it's very simple, but then the best ideas often are.
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Unread postAuthor: jean » Mon Dec 31, 2007 9:20 am

blind909 wrote:for airsoft bbs buy a 6.03, or 6.04 mm barrel.



yes i will... but where.. :(

no topic a pic fron holland airgun
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Unread postAuthor: Antonio » Thu Jan 03, 2008 5:11 am

jean wrote:sorry for double post

ant can you tell me where you by the 6mm barrel?
i by a 6mm id aluminium tube but the airsoft bb´s don´t fit. the barrel is to small.
i buy in homedepot and the manufacturers call "alfer" http://www.alfer.com

please tell me the name of homedepot you buy the barrel holland is neighboring country so i can buy it.

thx jean


Hey I have looked in Holland and in Germany for these barrels. Ofcourse they are not rifled. This is actually how it all started, I took a 6mm bb gun ball to different shops to c where it would fit in. If you go to construction shops (like the Gamma, Praxis, Toom) you will find a section with small aluminium or copper pipping. Take a bb gun ball and try it in the different pipes, in some it will fit and in others not. So make sure u take a ball to try/test the fit. These pipes cost around 1-2Euro, so not that much. They come in lengths of 1 meter. There is a pipe that fits in it, there is one that fits the barrel on the outside and a real copper pipe(12mm) fits the outside pipe. Like this you can make a very good sealed off sliding system''.

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SPG wrote:In many ways this is like the Gunpower Stealth range of airguns Airforce Talon in the US of A), except - they're single shot, and they don't move the whole barrel back to tirgger the hammer valve, just a sliding sleeve.

Image

Image

I like it though, it's very simple, but then the best ideas often are.


I have seen this gun before on the net. Wasnt sure how it worked though. Looks like a good project to make this. Do u know how the loading port for the bb's closes off? I chose for a moving barrel as it seals of the loading port before the valve is hit.
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Unread postAuthor: jackssmirkingrevenge » Thu Jan 03, 2008 5:30 am

ant wrote:I have seen this gun before on the net. Wasnt sure how it worked though. Looks like a good project to make this. Do u know how the loading port for the bb's closes off? I chose for a moving barrel as it seals of the loading port before the valve is hit.


Some very detailed information about the mechanism here.

This particular style of valve is extremely efficient, in fact the Condor model which uses it gets some of the highest power levels and air efficiency in its class.
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Unread postAuthor: Antonio » Thu Jan 03, 2008 5:34 am

jackssmirkingrevenge wrote:
ant wrote:I have seen this gun before on the net. Wasnt sure how it worked though. Looks like a good project to make this. Do u know how the loading port for the bb's closes off? I chose for a moving barrel as it seals of the loading port before the valve is hit.


Some very detailed information about the mechanism here.

This particular style of valve is extremely efficient, in fact the Condor model which uses it gets some of the highest power levels and air efficiency in its class.


Hey thnx man! Looks great! Check out my new post on the Drozd gun, as it should be promising
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Unread postAuthor: SPG » Thu Jan 03, 2008 6:30 am

I can fully vouch for the power and precision of the Airforce system, mine is my favourite air rifle by far even though loading is a bit fiddly.

There's news on the Airforce Talon site about a repeater being introduced 1st quarter 2008, and it'll be a retrofit. Given the simplicity of their current gun, I'll look forwards to seeing how they've made it repeat, and whether I want to fit it to mine (OH YES I DO, I DO, I DO).
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Unread postAuthor: jackssmirkingrevenge » Thu Jan 03, 2008 6:42 am

SPG wrote:There's news on the Airforce Talon site about a repeater being introduced 1st quarter 2008, and it'll be a retrofit.


Bob Craske who did the tuning page had worked on something of the sort, here it is.
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Unread postAuthor: jean » Sat Jan 05, 2008 3:07 pm

ant wrote:
jean wrote:sorry for double post

ant can you tell me where you by the 6mm barrel?
i by a 6mm id aluminium tube but the airsoft bb´s don´t fit. the barrel is to small.
i buy in homedepot and the manufacturers call "alfer" http://www.alfer.com

please tell me the name of homedepot you buy the barrel holland is neighboring country so i can buy it.

thx jean


Hey I have looked in Holland and in Germany for these barrels. Ofcourse they are not rifled. This is actually how it all started, I took a 6mm bb gun ball to different shops to c where it would fit in. If you go to construction shops (like the Gamma, Praxis, Toom) you will find a section with small aluminium or copper pipping. Take a bb gun ball and try it in the different pipes, in some it will fit and in others not. So make sure u take a ball to try/test the fit. These pipes cost around 1-2Euro, so not that much. They come in lengths of 1 meter. There is a pipe that fits in it, there is one that fits the barrel on the outside and a real copper pipe(12mm) fits the outside pipe. Like this you can make a very good sealed off sliding system''.



thx toom is my favorite and it was alfer tubing
my problem was all the pipes was cuttet with a saw and on the end was a little groin(?) so i can`t fit the bb in homedepot.
today i found a alutube.
thanks for help.

jean
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Unread postAuthor: brogdenlaxmiddie » Sat Jan 05, 2008 6:23 pm

removal of duct tape would be nice, :P but besides that... niceeee
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Unread postAuthor: nsane-spuds » Tue Jan 08, 2008 8:29 pm

Nice... I had a similar idea a while back but i thought it would be impractical because it would use up to much air per shot but i guess I was wrong... Anyways, seeing how air efficient it is, I was wondering... why not change the bottle for a propane tank? They are pretty cheap. 4$ or 5$ if I remember.
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Unread postAuthor: Antonio » Wed Jan 09, 2008 3:41 am

nsane-spuds wrote:Nice... I had a similar idea a while back but i thought it would be impractical because it would use up to much air per shot but i guess I was wrong... Anyways, seeing how air efficient it is, I was wondering... why not change the bottle for a propane tank? They are pretty cheap. 4$ or 5$ if I remember.


I tried that as well, but propage tanks have a valve at the top. I put the tank inline with barrel and all, but this valve wasnt very efficient. The rubber next to the rubber stopper in the propane tank also got damaged due to the hammer hitting its sides and not the valve. I did this measurement, and thickwalled (original) cola bottles can withstand 23 bars of pressure until it breaks. Plz dont try though. My gunz work at 8bars atm but shoot at amazing speeds, accuracy and efficiency. I do have one problem though, if my bb's fly too fast the seam on the ball has allot of effect and the balls wont fly straight anymore. I tried making my own hopup, but due to these seams it didnt work very well.
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Unread postAuthor: nsane-spuds » Wed Jan 09, 2008 2:10 pm

I was looking at the internals and evrything and I just cant figure out exactly how it works... If i understand, when you press the trigger it realeses the barrel (the hammer) wich is pushed by that spring and hits the valve, this realeases air in the barell, But i cant understand how the barrel is pushed back into place.

And also, how exactly does the trigger work?

Thanks in advance
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Unread postAuthor: Antonio » Wed Jan 09, 2008 6:22 pm

nsane-spuds wrote:I was looking at the internals and evrything and I just cant figure out exactly how it works... If i understand, when you press the trigger it realeses the barrel (the hammer) wich is pushed by that spring and hits the valve, this realeases air in the barell, But i cant understand how the barrel is pushed back into place.

And also, how exactly does the trigger work?

Thanks in advance


Plz check my new posted gif for the answer. Hopefully it makes it all clearer.
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Unread postAuthor: nsane-spuds » Sun Jan 13, 2008 9:30 pm

I was thinking how it could be possible to acomplish full auto with your desing while keeping it as simple as possible and I came up with this... What do you think?
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I forgot to draw the spring that pushes the barrel...
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