The theory is that gas has the potential to create a better range due to the gas expansion, but it's still a theory. Gas guns are still unstable in temperature for the most part with the exception of CO2. A heavier BB can help, but BB weight should be somewhat matched to your FPS level, and has nothing to do with what causes the BB to travel. A WE open bolt is a good start in the gas world, but I'd suggest an RA-Tech custom. Basically they take guns like the WE open bolt, and get rid of the kinks. To this day going FPS for FPS the best range and accuracy I've seen from any weapons would be the Systema PTW, and a Tokyo Marui VSR springer. The best gas platform I've seen is the WE open bolt M14 RA-Tech level III, but that didn't match the range and accuracy of the others. I personally have a Ares AW .338 gas sniper system shooting around 480 FPS, and cannot recreate the distance of my Systema. It'll be hop-up, airseal, quality, and tolerances; matched with FPS and a high grade appropriate BB that'll dictate your distance and accuracy.
If your looking for the be all and end all of distance and accuracy, expect to spend between $1500 - $2500 on an AEG, Springer, or GBBR when all is said and done with upgrades and modifications. If you are on any kind of a budget, I'd suggest an AEG like the KA M4, or if you prefer a scar try the CA Scar. That'll save you from really expensive magazines, upgrades, replacement parts, and all the issues of gas like leaky mags and broken bolt guides.
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Last edited by Ricochet; January 9th, 2013 at 10:35..