What is the difference between these airsoft guns?

I've been looking at airsoft guns and realized that the there are Gas airsoft guns. My questions are.
Is there a difference between gas and co2 powered guns, or are they the same?
Gas powered airsoft guns have Blow Back, and Non Blowback types, what is the difference?
What is the best airsoft gun, spring, electric, or co2?
What is the best action gun One shot (whatever only shooting one then reloading again is) Semi-Automatic, or fully automatic.
And what guns to use in what situations?



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Green gas/propane guns and CO2 powered guns are pretty much the same. The difference is just that they use different types of gas as propellant and CO2 tends to be slightly more powerful.

Blow-back gives the action of a real automatic handgun for example. A little bit of gas is used to "blow-back" the slide/bolt to load the next BB and give everything a realistic feature. Non blow-back guns don't do that and use an internal reloading system.

Personally AEG's are the best, they offer great all around playing anytime anywhere. Springers are mostly sniper rifles and shotguns, and gas guns tend not to work very well in cold weather.

Unless you're playing a marksman role a single action gun is pretty much worthless. AEG's usually will have both semi and auto modes and like i said before they can cover about every mission type anywhere.

Mods, thread move please

Jashim, what sort of environment would you be playing in?