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How does this semi-auto gun work?

This area is for the discussion of BB or airsoft sub machine guns, and or other small arms such as pellets.
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Unread postAuthor: Carlman » Tue Jul 29, 2008 1:15 pm

could a very quick and trusty paint diagram be undertaken?

is a spring necessary because i plan to have a stick mag like in the video slightly off vertical or a hopper
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Unread postAuthor: potatoflinger » Tue Jul 29, 2008 1:19 pm

It is possible that the feeding mechanism is just a tee with the exhaust port of the QEV on one side, the barrel opposite the QEV, and the magazine perpendicular to the barrel and QEV. (I'm not sure how well I explained that)
That was how I got my first bbmg to work, if you just let a little bit of air go through, it will fire a short burst, but if you let a constant stream of air through, it will be fully automatic.
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Unread postAuthor: Carlman » Tue Jul 29, 2008 1:29 pm

yes but like the gun in this video i wish for semi auto single shot
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Unread postAuthor: potatoflinger » Tue Jul 29, 2008 1:30 pm

That's what you would get with a QEV, since it is only a short burst of air.
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Unread postAuthor: jackssmirkingrevenge » Tue Jul 29, 2008 1:31 pm

I'd love to oblige with a drawing but I'm on an old laptop at the moment and after a busy day at work I don't think I could stand the frustration ;p
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Unread postAuthor: Carlman » Tue Jul 29, 2008 1:37 pm

no probs jrs im pretty sure i get it, just low on funds at the moment so cant really afford to bugger it up just for learning purposes :D
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like this then aye?
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Unread postAuthor: POLAND_SPUD » Tue Jul 29, 2008 2:07 pm

but if he used a bolt he could add a much better magazine than a ~40 cm long vertical tube... so IMO the guy uses an o-ring setup

EDIT
@carlman yes



EDIT no 2
9/32"

WTF is this? how can you use imperial units :shock: :D

LOL it's 21st century.... wake up !!

excuse me I am looking for 14/345 dm of 17/65 cm pipe..... where can I find it ?
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Unread postAuthor: Carlman » Tue Jul 29, 2008 2:09 pm

true... :D

but i cannot find a compression T over here in 1/4" grr
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Unread postAuthor: POLAND_SPUD » Tue Jul 29, 2008 2:20 pm

a compression fitting is not the best idea here becasue most likely it won't let BBs through... (its ID is lower than the ID of the tube)
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Unread postAuthor: Carlman » Tue Jul 29, 2008 2:24 pm

its a 6mm compression T, and the tube is 6mm... im only using the structure then epoxy it.

i say 9/32" instead of what ever the metric is beacuse that is how small tube is sold in aus

EDIT: 6mm fittings can take 6mm brass tube through it
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Unread postAuthor: POLAND_SPUD » Tue Jul 29, 2008 2:33 pm

i say 9/32" instead of what ever the metric is beacuse that is how small tube is sold in aus
yeah I know it but still it has to be uncomfortable to use fractions.. so I am not criticizing you I just think that imperial sucks
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Unread postAuthor: Antonio » Tue Jul 29, 2008 5:10 pm

Carlman wrote:yes but like the gun in this video i wish for semi auto single shot


Me too:) I wonder what the efficiency is as he is using an air compressor. What I dont like though is that the trigger pull (speed) varies the opening time of the valve. This makes it kinda inconsistent. But cool concept anyways.
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Unread postAuthor: jackssmirkingrevenge » Thu Oct 16, 2008 12:49 am

Carlman wrote:could a very quick and trusty paint diagram be undertaken?


A little late but now that I made a small animation might as well stick it here ;)

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Unread postAuthor: VH_man » Thu Oct 16, 2008 4:54 am

Its that simple?

Why havent any of us done this before?

And that Airsoft gun is freakin sweet. Looks like alot of power too...... Although his Chamber is HUGE
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Unread postAuthor: jackssmirkingrevenge » Thu Oct 16, 2008 5:22 am

VH_man wrote:Its that simple?


Yep.

Why havent any of us done this before?


Personally, I always wanted to use airgun pellets as ammunition, with this design you're limited to spherical ammunition only and this is why I never went with it.

Looks like alot of power too...


Not really, but if used at normal compressor pressures instead of 40 psi it would certainly be more impressive.
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