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Need Some Advice

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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Need Some Advice

Unread postAuthor: vng21092 » Tue Dec 17, 2013 1:26 pm

http://i.imgur.com/5WLvGuK.jpg
So this is the setup I currently have at the moment

How can I gain some velocity and/or range? Would achieving higher pressures help by much? I'm still looking to make the barrel longer since it's only 14 inches right now, how much longer would you guys advise? Also, If I use those mini CO2 cartridges to achieve higher pressures in the gun, would the CO2 damage it in any way? The firing chamber is tiny, its 1/2'' pipe by 3'', any advice on that?
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Last edited by vng21092 on Sun Apr 20, 2014 10:38 am, edited 1 time in total.

vng21092
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Re: Need Some Advice

Unread postAuthor: Ragnarok » Tue Dec 17, 2013 2:31 pm

To answer those questions in some sort of order:

- More pressure will be one of the more effective ways of increasing energy.
- The best barrel length is "as long as you are happy to put up with".
- CO2 probably won't cause damage, but bear in mind that CO2 is a dense gas with a low speed of sound - a factor that may actually cost performance.
- I'd still keep it pretty small. As it is, 1/2" diameter by 3" length might not seem like much, but it's already pretty dang huge as compared to your barrel volume and making it larger will just use up your onboard air faster.
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Does that thing kinda look like a big cat to you?
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Re: Need Some Advice

Unread postAuthor: Andrew_J » Sun Apr 13, 2014 2:46 am

Hey,
How much pressure do you have and why do you have a ball valve when the slide valve shuts the air of.
Is it to so you can regulate it a bit?
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Re: Need Some Advice

Unread postAuthor: vng21092 » Sun Apr 20, 2014 10:37 am

well I broke this down a while ago, I had it at about 150 psi from a bike pump because that was all I had. When you push the slide valve forward to fill the chamber, a bit of air leaks out. If for some reason the slide valve jams or you move it too slow, a lot of air will leak out. The ball valve prevents that bit of air from leaking, saving you a couple of shots. And I guess it sorta acted as a safety also.
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Re: Need Some Advice

Unread postAuthor: bravootome » Sun Apr 20, 2014 3:41 pm

it's time to build another one !
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come undone
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Re: Need Some Advice

Unread postAuthor: vng21092 » Mon Apr 21, 2014 6:09 am

working on it sir =], building a .177 line-fed hammer valve
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