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umm i have never heard of CO2 that is less affected by weather. I believe that CO2 is affected by temp to the same degree as propane. i think CO2 might be more expensive because you will have to buy the individual cartridges as opposed to 3 propane tanks for $15 after tax. you also have to make sure your gun can handle CO2. I.E. for some guns, you can buy CO2 mags, others you cant. one cannot simply fill a propane mag with CO2. you need specific mags that take the individual CO2 cartridges.
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