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Old 03-14-2011, 07:08 PM
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c02 or HPA?

I have a kjw m700, and i'm building an air rig for it. It currently has a 6.01 tightbore and thats it. I run propane right now but the fps discrepency between shots causes horrible consistancy in my accuracy. I know how to build an air rig and know basically how i'm going to do i, the big question I have is whether i should use a quick change co2 system or a small hpa tank. The whole co2 system would fit in the stock and run off 12g co2, but i'm worried about the effect cold winter weather would have on the consistancy of the co2. The hpa tank would probably go in a backpack or i'd use a paintball rig or something, I would get more shots per tank and not worry about consistancy, but the co2 being in the stock would be much more convenient. Anybody got input or suggestions.

btw, when i install the rig i will also be installing a polarstar striker spring.
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Old 03-14-2011, 08:27 PM
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While I am not an expert with Airsoft Guns using Gas I can say that from my Paintball days Air is always better then CO2. CO2 is dirty and has horrible fluctuations at colder temperatures. Advantage is its cheap and can be procured at several places. Obviously paintball fields, I know our local Dunhams Sporting Goods Fills them or you can do exchanges at Lowes in the Tool Department. Tanks are cheap but must be replaced or recertified after 5 years.
Air is the much better choice because its clean and very consistent with temperature changes but has some drawbacks. 3000psi and 4500psi tanks are very expensive(upwards of 200 dollars). They also must be recertified every 3 or 5 years. I also believe they are no good after 15 years. Also, you have to have them filled at either a paintball facility or a scuba place.(takes a special compressor to fill them.)

Now, when I played paintball I would get about 1200 to 1500 shots out of a 20oz. tank. I am assuming that it takes more gas to fire a paintball then a bb but I dont know for sure. Going by that assumption a 12oz tank might due you just fine all day long. Again, I am theorizing.
If this is the case then CO2 might be the better choice.

Ultimately the decision is up to you and how much dough you are willing to let loose of. Hopefully someone out there has some better insight into the CO2 usage with the weapon you are refering to.

Hope this helps. Good luck
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Old 03-14-2011, 09:45 PM
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Personally, I've seen the KJW rifle used with Propane, Greengas, and CO2. The only one i saw that could maintain consistent pressure was using a regulator with CO2. Even then, the mags almost had to be completely rebuilt. The guy used a small Paintball tank. Mag changes were painful to watch.

For colder weather, there is a rather novel approach. Buy a Spring Sniper rifle for cold weather. You don't have to worry about gas pressure dropping or gears freezing up. Spring sniper rifle gives you an all weather sniping platform at a fraction of the cost of Gas.
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Last edited by Texx; 03-14-2011 at 09:52 PM.
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Old 03-25-2011, 07:36 PM
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Thanks fo the input guys. I know all about how to mod my magazine for it to work and I know how to build the whole rig. I just basically was wondering if co2 or hpa would be a better choice as far as the propellant. I'm currently using propane, but the smell is terrible and it lacks consistancy. I'm leaning towards hpa because i like to play in the winter and the whole reason for me doing this mod is to increase my consistancy. Again, thanks

Last edited by Big_Pep_Sniper; 03-25-2011 at 08:23 PM.
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Old 03-25-2011, 07:51 PM
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Also, on a side note. If anyone knows a good aftermarket hop up unit and bucking for this gun, I would greatly appreciate if you could bestow this knowledge upon me. lol
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Old 04-11-2011, 05:07 PM
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Ok, I got my reg, Working on getting the rest. When I install this i'm going to upgrade the striker spring,hop up unit and bucking. Anyone know what is the best type or just a list of compatible units/buckings. It would be greatly appreciated.

Last edited by Big_Pep_Sniper; 04-20-2011 at 10:26 PM.
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