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Thread: gbb conversion to HPA

  1. #1
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    Default gbb conversion to HPA

    Just wondering has anyone done this?, would save loads of money buying c02/gas and would imagine quite a few guns could have a tank mounted on them instead of having a seperate tank and line.

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    Default Re: gbb conversion to HPA

    Why would you want to mount an air tank on your gun? Its too close to paintball for my liking...

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    Default Re: gbb conversion to HPA

    If the tank could be concealed properly like say for instance in the recoil tube/butstock with a regulator you would get far more shots than with small co2 cartridges or gas. Just a thought.

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    Default Re: gbb conversion to HPA

    or a pre charge pneumatic airsoft gun like an air rifle

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    Default Re: gbb conversion to HPA

    long thin tube. Pump it up and youd get LOADS of shots per fill

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    Default Re: gbb conversion to HPA

    Youll also probably not be allowed to have that on your regular site.

    Propane is a far better route if you want to save money on gas guns


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    Default Re: gbb conversion to HPA

    why do you think it would not be allowed? it works on the same principle as a classic airsoft gun, which isnt normally restricted...it only fires air, so its not as dangerous,and can be regulated to keep it at a very steady and safe limit
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    Default Re: gbb conversion to HPA

    Ah I thought we were stil talking CO2

    How would you even get the air from the stock tube into the gun though? normally it comes from the mags...


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    Default Re: gbb conversion to HPA

    If you are going down the HPA route with an external gas tank you might be better at looking at the Sun projects guns as this is how they are setup already. If you did this with a WA,WE or any modern GBBr then you have all the disadvantages to that system, but not the one main advantage.

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    Default Re: gbb conversion to HPA

    like mentioned above it would be like a pre charged pneumatic gun...the resevoir would be held in the stock tube,the dimensions are good enough,and you would use normal midcaps.
    i have no idea,how it would be done exactely but ive seen pre charged guns working in a similar fashion
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    Default Re: gbb conversion to HPA

    OR, radical idea here...

    Use propane?

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    Default Re: gbb conversion to HPA

    There's a guy on the gas guns forum that's done this, you may want to have a look around on there as i *think* he posted a guide. Main advantage is that you can get hundreds of not thousands of shots per fill of the tank and you may also get it filled for free from some places. It's also not as effected by the cold as propane iirc so there are some good things about it but i would also assume it requires a lot of work.

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    Default Re: gbb conversion to HPA

    That sounds interesting i'll take a look on the forum, i reckon if a good job was made of the conversion it would be worth it. For the gbb m4 say the custom cylinder could be mounted in the stock and the regulated air piped through to the front valve which could be attached to the gun as opposed to in the mag it should be a good system.

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    Default Re: gbb conversion to HPA

    You would not be able to mount a HPA tank in the stock of a M4, the pressure is too much, and therefore has to have think walls.

    You will be able to mount a CO2 tank in the stock, like a RAP4 style system.

    Have a look here:

    http://goo.gl/OYjH7

    It's not quite the same as the system you want, but it'll get you started and show you what type of equipment you need.

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    Default Re: gbb conversion to HPA

    Quote Originally Posted by happyal View Post
    You would not be able to mount a HPA tank in the stock of a M4, the pressure is too much, and therefore has to have think walls.

    You will be able to mount a CO2 tank in the stock, like a RAP4 style system.

    Have a look here:

    http://goo.gl/OYjH7

    It's not quite the same as the system you want, but it'll get you started and show you what type of equipment you need.
    Could you use that same tank for Propane and other gasses?

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    Default Re: gbb conversion to HPA

    Quote Originally Posted by Boo-Sabum Ben View Post
    Could you use that same tank for Propane and other gasses?
    I don't know, I think if you could fill it then it would be OK. But then again it has a regulartor on the bottle that brings down the pressure from 3000psi to approx 800psi. So I doubt that propaine would create the pressure required to open the valve.

    I've never heard of anyone trying to use another gas in a HPA bottle. It's really easy to get a HPA bottle filled. Any dive shop will be able to fill it for you.

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    Default Re: gbb conversion to HPA

    some dive shops can be funny if your bottle doesnt have a valid test certificate
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    Default Re: gbb conversion to HPA

    Would you not then have an m4 that needed to be cocked every shot? HPA mod is fine on sniper rifles but they are single shot, i'm struggling to see how you would be able to use this in a Gbbr and surely the cost of building one of these you could probably buy enough mags and propane that you'd never have to worry about cooldown..

    I would really be interested to see this done but OP are you aware of how much cost and time would go into it? Some of the Guys on Gas Guns that do these custom builds are professional gunsmiths and work with those types of components every day.

    If you do go for it, genuine good luck and please post a project guide:D
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    Default Re: gbb conversion to HPA

    I dont think so it should work in exactly the same way with the regulated air supplying the front valve expansion chamber. I think this should work and look ok:

    Custom HPA tank/regulator mounted descreetly in m4 stock maybe directly under recoil tube.

    Flexible Black plastic pressure line routed from tank descreetly to front valve idealy inside body close to trigger block.

    Fixed valve/expansion chamber which will allow magazine to be inserted and removed in same way, this can fit in the void of magazine where originaly it would be part of it but would now be attached to body. No more hastle gassing mags up.

    If done properly i cant think of any disadvantages, the gun would strip down just the same without too much in the way just the cylinder which i'm sure could be well hidden in a custom stock like the batterys on aeg's.
    Last edited by jlb1974; 28th June, 2011 at 22:14.

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    Default

    What about the bolt and nozzle? It'll have to be custom and in what body?
    Quote Originally Posted by Bluegill View Post
    5 years Backyard Skirmishing...

    I hope that's not an airsoft euphemism

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    Default Re: gbb conversion to HPA

    Just within the body of the gun itself, the valve and chamber would no longer be needed in the mag so they would go leaving the mag empty apart from the bb part. A replacement valve and chamber would be permenantly attached to the lower gun body in front of trigger assy and deliver the gas/air in same way so no need for different bolt/nozzle. The mag would haveto be modified slightly at the point where the valve would now be attached to gun body so it can go all way up.

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    Default Re: gbb conversion to HPA

    The HPA is just a power supply, the gun itself doesn't care what type of gas is used so it doesn't matter if it's propaine, red gas, CO2 or HPA it'll work the same way. The only difference is the way that gas gets supplied to the gun.

    Also HPA does not require an expansion chamber, this is because HPA is always gas, ulike the other common gas used in sirsoft which are normally stored as a liquid.

    Here is a short video of a Sun Projects GBB, I'm using HPA to power that gun and as you can see it isn't a single shot gun at all.

    http://goo.gl/brk3F

    Also a Real Sword Type 56 that has been modified with a Exscort system (in slow motion)

    http://goo.gl/y6OaS

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    Default

    Your missing my point, clearly you have a plan...so what components?
    What make are you looking to build it from? WE, WA, KJW, WOC ?

    Its easy to say 'im going to put this bit on that bit and it'll work' but thats just words.

    I have genuine in this if you are serious in building.
    Quote Originally Posted by Bluegill View Post
    5 years Backyard Skirmishing...

    I hope that's not an airsoft euphemism

  24. #24
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    Default Re: gbb conversion to HPA

    I would use the we m4 closed bolt, if rigged up properly it will work.

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    Default Re: gbb conversion to HPA

    What tank are you planning to use, to fit it in an m4 stock? I've looked at loads of different possible solutions and so far I have yet to find an hpa tank that even fits in a 40mm tube, never mind the stock :S

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    Default Re: gbb conversion to HPA

    The best thing maybe to have one custom made and also mount it under the recoil tube as descreetly as possible like the aeg batterys. I would probably make a custom recoil tube out of metal which would do the same job but also accomodate the new tank underneath. Stock adjustment wouldnt be a problem so would have the length the same as in the extended position which would allow for a larger tank.

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    Default Re: gbb conversion to HPA

    you could use a precharged air pistol resevoir
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    Default Re: gbb conversion to HPA

    Not a bad idea, wonder how many shots you would get from it?

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    Default Re: gbb conversion to HPA

    trouble is, i think it would be in the region of about 50 shots
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    Default Re: gbb conversion to HPA

    I think a bigger tank would be needed. Have noticed some precharged rifles which get around 150 shots on a tank which should go under the recoil tube on an m4.

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    Default Re: gbb conversion to HPA

    All interesting points I d definatley be interested in this
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    Default Re: gbb conversion to HPA

    heres safe a way http://ripperkon.de/projekte/hpa-sys...in-hpa-system/
    its in german so google translate it

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    Default Re: gbb conversion to HPA


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    Default Re: gbb conversion to HPA

    Quote Originally Posted by WorMongers View Post
    With Polar star you don't get the recoil which I think people are looking for.
    TAE

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    Default

    What's your suggestion?

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    Default Re: gbb conversion to HPA

    why do you want to put it under the recoil tube and pipe it? wouldnt it make more sense to put a custom tank in a foregrip like a front wired aeg's battery? then you could make a minor alteration the the gas feed, and maybe even still be able to use traditional mid or hicaps without hacking parts off them? plus you wouldnt get an unsightly external gas pipe then
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    Default Re: gbb conversion to HPA

    I dont mind the pipe at all..used to it from paintball
    what you think about this? http://www.bingoairsoftworks.com/

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    Default Re: gbb conversion to HPA

    What about storing the pcp cylinder in a broken under slung grenade launcher, that way you would get more space than n a buffer tube and could possibly think about carrying multiple tanks into the field, as you could reload a tank like you would a grenade and re attach the pipe. As for feeding from a mid cap I honestly do not see that working, unless you run a double mag type thing with a hi cap feeding into the standard mag tube,OR you could run the tube into the gun and hook it directly to the brass tube (WE closed bolt for this) so the tube never shows on the outside of the rifle then modify a hi cap to use the gbb mag lips.
    Just ask me if you would like anymore help on this idea, I also have a couple spare brass tube and barrel assemblies if anyone wants to have a go at this
    Chas
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  39. #39
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    Default Re: gbb conversion to HPA

    Run the gas gas tube into the gun that is
    "They've got us surrounded again the poor bastards"

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    Default

    I'd rather have 2 tanks on my back..I mean one tank is more than enough for assault, prob 2 if you support.
    All that extra weight at the front is no good, plus you can prob only fit a 88g sized co2 or equivalent hpa tank
    in the launcher at best.
    I think the mag option is good too. Just mod a few mags with qd valves rather than a permanent connection.
    Play in any weather! No fusion engine etc modded for a lot of recoil, should be mui caliente!

  41. #41
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    Default Re: gbb conversion to HPA

    The new g&g g96 co2 version has a internal tube system..still prototype stage but when produced id imagine they will adapt that system to other weapons too.
    http://forums.zeroin.co.uk/showthrea...Shell-Ejecting

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