Quick math:
Gas has a couple of pros over AEGS, and vice versa. Unless one system has many more pros, it won't be able to replace it.
Gas is more fun and realistic to use, but performance is hindered by inconsistant power and cool-down with accuracy and sustained fire suffer adversely affected. In Canada and other Northern nations, these guns will have a limited useability based on temperature. And, as mentioned, propane stinks and if one isn't dilligent taking care of their expensive mags, they WILL leak.
AEGs are less realistic and fun to shoot and make that whiny motor noise, but can operate year round. Shot consistancy and sustained fire are not a problem. Mags are cheap and plentiful and they don't stink.
Certainly, gas is a revitalized power source for a main gun and one cannot deny the entertainment and 'cool' factor of squeezing off a burst with a GBB full auto, but a lot of the value of gas is in the look/feel, not the performance.
GBB - as augmentation, not replacement for most. If you only play indoor or a few games in summer, YMMV.
Kelly.
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