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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: kuya » Tue Jan 15, 2008 1:09 am

Hi all. I have just joined and ave a quick question. Im planning to build a Semi-Auto similar to Jacks one here. I was just wondering if there would be any difference if i changed the input flow into a shrader. As I onlyhave a car tyre inflator atm. Also how well would a co2 bike pump work on it?
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Unread postAuthor: jackssmirkingrevenge » Tue Jan 15, 2008 1:40 am

It could work, technically that design allows a certain pressure buildup before the gas can escape through the barrel. What materials were you planning on using, that type of construction requires a certain level of experience to get right, but there are other ways of making the same design depending on what you have access to.

A co2 inflator should last for a good number of shots - with constant flow it was good enough in this case for a small BBMG.
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Unread postAuthor: kuya » Tue Jan 15, 2008 1:53 am

Well a Syringe lol, My Dad is a Lab Analyst like you =P. I have an extremely low Budget. As I Just spent my money overseas. I dont really know what materials at the moment. Although most likely a brake line for the barrel. Id really like it to work though, as it is now near impossible to get a BB Gun in Australia. Im hoping for some decent power.
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Unread postAuthor: jackssmirkingrevenge » Tue Jan 15, 2008 2:23 am

Cool, then you have some common sense to assist you :)

If you intend to use epoxy, I strongly recommend checking out my advice on casting and making pistons - it's worth investing a bit of money getting proper epoxy, if it will help getting financial backing then I might point out that good adhesive has 1001 other uses around the house, my family has a constant list of broken shoes, ornaments, door handles etc. that need repairing.
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Unread postAuthor: kuya » Tue Jan 15, 2008 2:36 am

Hehe I've been through the files already. I probably will get some. Right now the iggest finacial expense is the bike pump. But I wont get that just yet, since i dont know how well it will work. =]
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Unread postAuthor: jackssmirkingrevenge » Tue Jan 15, 2008 2:39 am

You're refering to one of these, yes?

Image

While it has greatly reduced flow compared to the blowgun I used, the CO2 is at higher pressure so you should be fine in terms of performance.
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Unread postAuthor: kuya » Tue Jan 15, 2008 5:20 am

Yes I am referring to one of those and thats good to hear that it will perform fine. I was just wondering where you got your spring. I cant find any around the house (Havent had the chance to go out since I came across this site (last night). Sorry for kind of just copying you. But I thought I should go for something that has been proven to work for my first project.
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Unread postAuthor: jackssmirkingrevenge » Tue Jan 15, 2008 5:59 am

To be honest I think this is a little too advanced as a first project, but suit yourself. I have no idea where the spring came from, I keep a box of components from various appliances I regularly dismantle :)
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Unread postAuthor: kuya » Tue Jan 15, 2008 6:18 am

I think I'm capable. Although what would you suggest as a first project? I might still change my mind. I wish i had money to dismantle various appliences =[. For now I'll stick to the unsed junk in the garage. =]
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