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Building full auto steel BB gun need help!

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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Building full auto steel BB gun need help!

Unread postAuthor: eliechahine » Tue Apr 09, 2013 8:22 am

Hello,

I just joined today, i really admire this forum because of it's members, quite the elite when it comes to stuff like this.

It's my first build, i really can use and appreciate all the help i can get.

All i know is this:

I will be buying a 3000 psi paintball air tank with a regulator
a 200-is psi QEV (can't find any QEV that can hold more)
will be using the old barrel from my springer
blowgun as trigger

Well what am i missing out? i heard you need a pilot, and i really want my shots to be powerful, i'm not building it as an airsoft gun, it will be shooting steel pellets or BB's.Please tell me all the parts or missing stuff that i need..

Any help appreciated!!

And thanks for reading all this!!

PS: I came out with this design (4 stands for the QEV)
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Quite primitive and might not work..just so you get the idea :)

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Unread postAuthor: jackssmirkingrevenge » Tue Apr 09, 2013 11:51 am

Welcome aboard :)

It seems you have misunderstood the concept of a semi auto quick exhaust valve setup though, the blowgun isn't the right valve, what you want is a three way valve.

A slide valve is an example of this, have a look: http://www.spudfiles.com/forums/semi-au ... 23626.html
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Unread postAuthor: eliechahine » Tue Apr 09, 2013 11:57 am

Thanks for your reply and greetings!!

I'm going for full auto actually, and after spending a few hours studying some design i realized mine was flawed, So i remade it..

Will this work as a full auto BB gun?

http://ctrlv.in/178516

Thanks again for the help!
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Unread postAuthor: jackssmirkingrevenge » Tue Apr 09, 2013 12:03 pm

You don't need the QEV at all - I suggest a pressure washer handle as a direct trigger.

Pretty much what I did here: http://www.spudfiles.com/forums/9mm-smg ... 19367.html

You don't need to regulate the paintball tank, just use 800 psi directly. The effects are most satisfying ;)

[youtube]http://www.youtube.com/watch?v=C9ocv_Jktag[/youtube]

Here's one made from standard parts:

Image
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Unread postAuthor: eliechahine » Tue Apr 09, 2013 12:07 pm

Well i thought of that too but i read somewhere that the tank will empty out in 2 seconds..

if it doesn't it's a great idea..and i'll make mine just like yours

Ow and one more thing, you think i can fit in a .177 barrel instead of the one you picked? so i can shoot smaller .177 BB's, I don't wanna blow up the neighborhood :p
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Last edited by eliechahine on Tue Apr 09, 2013 12:12 pm, edited 1 time in total.

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Unread postAuthor: jackssmirkingrevenge » Tue Apr 09, 2013 12:12 pm

Not really, with such high pressure you won't need massive flow for some decent destruction.
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Unread postAuthor: eliechahine » Tue Apr 09, 2013 12:17 pm

I'll try and see if i can ask a blacksmith or a weapon smith to thread my .177 Barrel then i can attach it directly to the paintball tank and handle and i'll find me a ball detent from somewhere ..Did i get your idea or am i missing something :p if so feel free to correct me
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Unread postAuthor: eliechahine » Tue Apr 09, 2013 1:06 pm

You think your idea will work on a .177 barrel and .177 steel BB's?
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Unread postAuthor: jackssmirkingrevenge » Tue Apr 09, 2013 1:51 pm

no point in using a rifled barrel with steel BBs, you're better off with a smooth bore.
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Unread postAuthor: eliechahine » Tue Apr 09, 2013 1:57 pm

Yeah you got a point,

And one more thing, how many shots you think you can pull off with a single charge?
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Unread postAuthor: jackssmirkingrevenge » Tue Apr 09, 2013 2:13 pm

Lots! If you make a cloud/vortex style BB chamber, chances are you're get a rate of fire of 100 plus BBs per second.

[youtube]http://www.youtube.com/watch?v=Xwnkmluc2H0[/youtube]
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Unread postAuthor: eliechahine » Tue Apr 09, 2013 2:19 pm

ohh

I meant with a single charge of the tank :P

Like 300 shots more or less before i have to recharge it? and i can do burst shots like pull the trigger then release then pull/release[etc...] right? or will it just shoot out all the BB's with one trigger pull?

Again thanks for your support it means allot to me
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Unread postAuthor: jackssmirkingrevenge » Tue Apr 09, 2013 11:46 pm

eliechahine wrote:Like 300 shots more or less before i have to recharge it?


I would guesstimate at least 500-1000 rounds before the air runs out.

and i can do burst shots like pull the trigger then release then pull/release[etc...] right?


Yes of course.
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Unread postAuthor: eliechahine » Wed Apr 10, 2013 1:06 am

one final thing and i'll stop bothering you :P

You think there is a simple way to reduce the ROF to about 10BBs/sec? or somewhere close to that
thanks!
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Unread postAuthor: jackssmirkingrevenge » Wed Apr 10, 2013 1:11 am

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