Home made co2 Airpistol?= need help / ideas

[django]

Well guys, For years ive wanted to make a co2 Powered Airpistol, preferably Semi Auto= over the years ive googled and tried to come up with a way to do it but still not been able to do so! .

I have a few mates that have wanted an Air Pistol for a long,long time and I get asked a lot if Ive been able to make one yet!? here in Australia I cant get Co2 Airpistol internals to use for construction so have to come up with some other way?.

I was thinking of somehow modifying a co2 bike inflator to a hammer valve but I dont think it can be done and also they only output at 100 psi or so from memory?. I wanted to have the pistol shooting the co2 at full 800 psi pressure as per .177 co2 pistols do, I dunno maybe its not possible? any help MUCH appreciated


also looking for air pistol schematics to help try figure out how I can make such a pistol? , ive not found much so far

http://www.pyramydair.com/schematics/rwsmodelc225.asp

[Lex]

Maybe something like this or that?

But be warned, unregged CO2 is nothing to play around with if you don`t know exactly what you are doing!

[inonickname]

What kind of materials and facilities do you have available? If you have a decent shop setup I'll dig up a few links for you.

[jackssmirkingrevenge]

I was thinking of somehow modifying a co2 bike inflator to a hammer valve but I dont think it can be done and also they only output at 100 psi or so from memory?

As far as I know they give the full pressure, I took apart my ultraflate and it looks like a simple sprung ball pushed down by a pin, no sign of any regulation.

I think the easiest possible solution that gives good performance would be to combine an inflator with a tee breech. The lowish flow rate of the inflator would be negated by the seal/detent that would hold the BB in until a certain pressure was reached at that point if would be the equivalent of a burst disk valve. Not sure if you have airsoft magazines avalable but I reckon Davidvaini had the right idea not to mention you technically have the option of full auto as long as the trigger is pulled.

You could also conceivably replace the trigger with a hammer if you want a "proper" semi-auto, are cap guns legal down under?

[POLAND_SPUD]

@jsr
yeah I guess he was right...
though I think it would be more practical if you build one with a small QEV or 3 way valve as the main valve (IIRC you have one, right ?)

you could even use the pneumatic fullauto / timer circuit as the main valve...

[jackssmirkingrevenge]

though I think it would be more practical if you build one with a small QEV or 3 way valve as the main valve (IIRC you have one, right ?)

you could even use the pneumatic fullauto / timer circuit as the main valve...

Hard to fit in a pistol sized package though eh?

[django]

Yeh we Are allowed cap guns but NO Airsoft gear at all, the joys of Aussie Gun Laws as far as I was Aware those inflaters were regulated down!?. Maybe specific ones are?, I looked on the packaging of one here and im sure it said it only output at 100 psi? so I never ventured that way with one for a Pistol.

I had thought of a 1/8 Qev and Poppet valve like my Pitbull 9 Rifle( that uses 1/4 gear though) BUT I wanted the pistol to take full co2 psi as being a pistol the barrel will be small so power will be very low unless full co2 pressure is utilised.....

[POLAND_SPUD]

well not really... the valve that I used in that experiment was the only one I could get at that time... so it wasn't very compact

5mm valves are smaller than a box of matches... 1/8" valves are almost exactly the size of a box of matches.. 1/4" ones are slightly smaller than a box of cigarettes

so it wouldn't be that difficult to put a 1/8" valve into the pistol grip

[urgle the danish cow]

jacksmirkingrevenges idea works very well. a friend and i did the same thing some time ago and it worked well except for it shoots full auto and you have to reload constanly. it also works well if you bend a small section of tubing up and around ( so then on top of the bike valve) into a bb chamber and just a bbmg from there. resulting in a very small pdw airsoft smg. then agian thats not semi-auto. just throwing it out there

[jackssmirkingrevenge]

Time to put my money where my mouth is, I'm should give the inflator + tee breech a go

[qwerty]

How many shots do you think you could get with one cartdridge? I might give it a go if it's not to money consuming.

[django]

Yeh I tend to think it will spit out more than one BB at a time Jack!, but if tolerances are tight then maybe its possible?,Id love to be able to finally crack the making of a High Powered co2 Air Pistol. Not only would I be be happy but my friends would finally have an Co2 Air pistol!, if construction was easy enough that is?

[jackssmirkingrevenge]

I'm giving it a whirl as we speak, will post when I have something worthwhile.

[qwerty]

Try making an inline hammer valve (abit like an XRV) i'll post a pic of mine an a bit.

[jackssmirkingrevenge]

Here's a preview of the prototype for this idea curing, it's all pretty ghetto but as just a proof of concept prototype, it "only" has to work

I'm also making an extended chamber with a schrader fill valve and half a used CO₂ bulb so there's extra air capacity and I don't have to spend money on cartridges in the off chance that it works