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BB feed method for semi-auto

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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BB feed method for semi-auto

Unread postAuthor: budabob07 » Fri Nov 12, 2010 8:52 pm

hi i am thinking about building a semi-auto 6mm airsoft gun. i have the mechanism that will deliver air (qev/blowgun etc.) but i am not sure how to make an easy to use magazine that will allow bb's to be fired without leaking air. i know how to do it bolt-action, but i want it semi-auto. does anyone know how to make a feeder/loader mechanism? thanks
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Unread postAuthor: jrrdw » Fri Nov 12, 2010 9:00 pm

Spring loaded tube. Just look at most of the magazines built here...
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Unread postAuthor: budabob07 » Fri Nov 12, 2010 9:07 pm

wouldnt the mag have to be air-tight with the rest of the system tho?
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Unread postAuthor: jrrdw » Fri Nov 12, 2010 9:12 pm

Barrel load right on the outside of the valve.
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Unread postAuthor: Immur4323 » Fri Nov 12, 2010 9:14 pm

Get a tube that fits the bbs with a hole small enough that bbs won't fall out and connect it directly under the barrel. When the air goes out the barrel and blows over the magazine with the bbs in it, it will suck the bbs into the barrel and shoot them out.
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Unread postAuthor: jackssmirkingrevenge » Sat Nov 13, 2010 2:25 am

You can bother with some sort of reloading bolt, like the blow forward bolt:

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Or go for blowback:

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For spherical projectiles like BBs though, a simple Tee breech without a bolt should suffice:

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Works for pellets too:

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Unread postAuthor: budabob07 » Sat Nov 13, 2010 8:00 am

thanks, ill probably just go with the tee. to make it airtight, im guessing that a compression fitting with the right sized tube would work. would it? thanks
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Unread postAuthor: jackssmirkingrevenge » Sat Nov 13, 2010 8:34 am

Have a look at this project by lozz08, I-m sure you-ll find it helpful.
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