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How to: .50 cal semi-auto

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Unread postAuthor: PotatoEnemy17 » Thu Aug 30, 2012 9:16 am

Awesome how-to video! I'm working on a semi-auto with same reloading mechanism, but I intend to use cartridges instead. And I'm so jealous of your valves. You just clean your room and you happen to find a couple valves laying around. :lol: can't wait to see what you turn this into!
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Unread postAuthor: wyz2285 » Thu Aug 30, 2012 12:35 pm

If I get any time, I´d make this in to a M82 look like .50cal rifle.
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CpTn_lAw wrote::D "yay, me wanna make big multishot pnoob with 1000 psi foot pump compressor using diamond as main material. Do you think wet bread make good sealant? " :D
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Unread postAuthor: silentkill12345 » Thu Aug 30, 2012 2:16 pm

CooperJS wrote:why would a single be easier, are there any differences?


lol, that is some basic pneumatics... a single one is much easyer because it has only one pilot side, the oter is exaust (waste air from the piston) also you need a les complicated (3/2 ventil (dont know te right word)), a double action piston needs a 5/2 ventil

this is in normal pneumatic diagrams not spudguns xD
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Unread postAuthor: wyz2285 » Thu Aug 30, 2012 2:37 pm

silentkill12345 wrote:
CooperJS wrote:why would a single be easier, are there any differences?


lol, that is some basic pneumatics... a single one is much easier because it has only one pilot side, the oter is exaust (waste air from the piston) also you need a les complicated (3/2 ventil (dont know te right word)), a double action piston needs a 5/2 ventil

this is in normal pneumatic diagrams not spudguns xD

You mean 3/2 valves...
Now stop confuse people, it´s not necessary to use a 5/2 valve to use a double acting pneumatic cylinder. I used a double acting with a 3/2 valve.
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CpTn_lAw wrote::D "yay, me wanna make big multishot pnoob with 1000 psi foot pump compressor using diamond as main material. Do you think wet bread make good sealant? " :D
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Unread postAuthor: Lazyboy » Thu Aug 30, 2012 5:03 pm

jackssmirkingrevenge Thought so :lol:
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Unread postAuthor: wyz2285 » Fri Aug 31, 2012 5:04 am

Shooting video
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Last edited by jrrdw on Wed Oct 30, 2013 10:04 am, edited 1 time in total.
Reason: Fixed video.
CpTn_lAw wrote::D "yay, me wanna make big multishot pnoob with 1000 psi foot pump compressor using diamond as main material. Do you think wet bread make good sealant? " :D
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Re: How to: .50 cal semi-auto

Unread postAuthor: jonesy42 » Fri Aug 31, 2012 9:07 am

wyz2285 wrote:My mom told me to clean my room and I found out I have a couple of QEVs, 3-ways and cylinders all around, I thought I´d make something with them and my friend had just got me some 12mm steel BBs.
So I made a simple .50 cal semi-automatic using 1/2 inch stainless steel tube as the barrel. It works like the most basic 3-way+QEV+pneumatic cylinder semi-autos, the cylinder it´s connected to the chamber of the QEV and it´s used for reload.
Any question just ask POLAND_SPUD :D
Part 1:

Part 2:



Hey wyz, can you make that set up a bit smaller, so i can fit it in this stock, :wink: lol.
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Last edited by jrrdw on Wed Oct 30, 2013 10:01 am, edited 1 time in total.
Reason: Fixed video.

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Re: How to: .50 cal semi-auto

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Unread postAuthor: wyz2285 » Fri Aug 31, 2012 1:53 pm

Check out the "how to make a semi-automatic airgun for beginners" thread (I'm on my phone so I can't link it, it's in the how to data base as well). But basically you just need to use a smaller 3-way and cylinder (probably order a custom one).
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CpTn_lAw wrote::D "yay, me wanna make big multishot pnoob with 1000 psi foot pump compressor using diamond as main material. Do you think wet bread make good sealant? " :D
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Unread postAuthor: silentkill12345 » Sun Sep 02, 2012 5:18 am

so simple but so nice :D now make it so it have more power for your steel bb's
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Unread postAuthor: wyz2285 » Sun Sep 02, 2012 5:21 am

Simple just use higher pressure. Kind loud when fire it with 20 bar or higher
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CpTn_lAw wrote::D "yay, me wanna make big multishot pnoob with 1000 psi foot pump compressor using diamond as main material. Do you think wet bread make good sealant? " :D
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Unread postAuthor: PotatoEnemy17 » Sun Sep 02, 2012 6:05 pm

Semi auto, power, ergonomics, all in one. Clearly something built by wyz2285 :D
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