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Actually, CO2 mags are only useful until about 0 degrees; below that you don't get much performance out of those little 12gr cylinders. In cold weather you're better using MAPP/Pro (in the propane mags).
With the right upgrades and used as a DMR, you should be able to get decent consistency and accuracy. But that being said, wanting to go with a Sniper/DM Rifle right off the bad is probably a poor choice: the idea you'll get better accuracy and range with them is fallacy in airsoft; you'll really just have the same gun as everyone else, only much more expensive and much slower (the springer bolt actions do have better inter-shot consistency, and are allowed more power which translates into a bit more range -- but most games won't allow that for AEG/Gas platforms).
Point in case is in the end, it'll result in frustration and disappointment. You should pick up a regular rifle and learn the ins and outs of airsoft. Your ability to build and use a good sniper/DMR platform relies on your understanding of what's going on with your airsoft gun. There's no magical "use X, Y, Z parts" formula that'll instantly turn you into a good shooter.
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