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Rough BBMG Plans

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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Rough BBMG Plans

Unread postAuthor: OfTheLion » Tue Nov 29, 2011 9:24 pm

Okay, so today I attempted to make some rough plans for my airsoft Browning 1919 BBMG in Paint. Please excuse the cruddy diagram, I was trying my best, but there's only so much quality you can get with Microsoft Paint. :wink: On the far right, there will be an air blower valve thing disguised as a trigger. I am employing the vortex cap method, so I need to know if a skirt is necessary. I'm going to use a 1" PVC cap, and the pink worm-looking thing is just some hose. Please feel free to correct my work. In fact, I would encourage you to do so. I'm really itching to start this project.

Thanks,
Ofthelion

P.S. (The CO2 tank is just a 20oz. paintball tank)
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Unread postAuthor: Gun Freak » Tue Nov 29, 2011 9:38 pm

That bb chamber looks enormous. It's way too big for enough pressure to build up and there is a ton of room for agitation. Make the chamber way smaller. Just use a smaller piece of pipe and put it inside the ammo can.
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Unread postAuthor: OfTheLion » Tue Nov 29, 2011 9:41 pm

So the ammo chamber has to actually be airtight? I was under the impression that it just held bbs to be sucked into the votex...
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Unread postAuthor: Gun Freak » Tue Nov 29, 2011 9:44 pm

Of course it has to be airtight, it holds the pressure that pushes the ammo... Do you ever see a proper vortex with a chamber that's not airtight?
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Unread postAuthor: OfTheLion » Tue Nov 29, 2011 9:46 pm

:oops: I thought there was a spring that pushed the ammo to the front, towards the vortex block... sorry, I was mistaken. *Facepalm*
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Unread postAuthor: cammyd32 » Wed Nov 30, 2011 5:40 am

Forgive me if I've missed something here but, where are you triggering it from? :wink:
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Unread postAuthor: jackssmirkingrevenge » Wed Nov 30, 2011 6:00 am

cammyd32 wrote:where are you triggering it from? :wink:


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Unread postAuthor: cammyd32 » Wed Nov 30, 2011 6:10 am

n the far right, there will be an air blower valve thing disguised as a trigger

I can swear that wasn't there when I read it through the first time :lol:
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Unread postAuthor: OfTheLion » Wed Nov 30, 2011 7:57 am

Not a problem... So I should probably use a section of maybe 3" PVC pipe for holding the ammo instead of just letting it sit there?
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Unread postAuthor: jackssmirkingrevenge » Wed Nov 30, 2011 8:36 am

OfTheLion wrote:So I should probably use a section of maybe 3" PVC pipe for holding the ammo instead of just letting it sit there?


A rectangular chamber that will be subjected to pressure is an extremely bad idea, so yeah, some sort of pipe hidden inside a box.

I had done something similar.

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Unread postAuthor: OfTheLion » Wed Nov 30, 2011 4:01 pm

Wow jsr, that's pretty slick looking. I'd love to see some pics when (if) you do make a plywood shell for it. :)

My only problem is that there is so little space in the reciever, and I already have pretty much everything destined to fit in there. I know that the PVC in the mag doesn't hold ammo, but that was kind of what I was aiming for, except one big pipe on the side of the gun... Like this: (Inside the ammo can)
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Unread postAuthor: jackssmirkingrevenge » Wed Nov 30, 2011 4:25 pm

OfTheLion wrote:Wow jsr, that's pretty slick looking. I'd love to see some pics when (if) you do make a plywood shell for it. :)


I made that in 2005, it's on the top of a wardrobe looking pretty much like that last photo but with more dust :)

My only problem is that there is so little space in the reciever, and I already have pretty much everything destined to fit in there. I know that the PVC in the mag doesn't hold ammo, but that was kind of what I was aiming for, except one big pipe on the side of the gun... Like this: (Inside the ammo can)


I would be more inclined to have the gas supply in the ammo box, and BBs in the receiver.

I think you'll find this interesting and inspirational ;)
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Unread postAuthor: OfTheLion » Wed Nov 30, 2011 4:58 pm

I think you'll find this interesting and inspirational ;)


One word: Beautiful

I do agree, that was my first inclination, BBs in the reciever and CO2 in the ammo can. The only problem I found while researching this is that when a CO2 canister is operated laying sideways, it will spray liquid CO2 into the internals of the gun. Now, I could get an anti-siphon tank to solve this, but I found some really low-cost 20oz. tanks, and I'm going to buy three to change quickly should I run out at a game. But if I'm mistaken and you can use CO2 tanks in a horizontal orientation, I would be all set... By no means do I have any experience with this at all... which is why I appreciate the input from you guys so much.
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Unread postAuthor: mobile chernobyl » Wed Nov 30, 2011 5:10 pm

You will be best off using an anti-siphon system. I've had to install them for myself and other while playing paintball and the difference is immediately noticeable.

A CO2 tank in the vertical position would still be ideal however, but that's not going to fit into your aesthetic limitations.
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Unread postAuthor: OfTheLion » Wed Nov 30, 2011 5:23 pm

mobile chernobyl wrote:You will be best off using an anti-siphon system. I've had to install them for myself and other while playing paintball and the difference is immediately noticeable.


So how easy is it to install an anti-siphon system on a 20oz. tank?

I'm a real stickler for aesthetics, hoses sticking out would annoy the crap out of me. :D
It'd probably be way easier to stuff an actual gearbox in the receiver like Killbucket: http://www.air-sharp.com/351series3.htm
But what fun would that be? :tongue3:
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