Interesting question! If you're talking about pistols, C02 is definitely the way to go. Electric pistols are usually made cheaply, but C02 pistols seem to last forever. I've had one for about 1 and a half years and it's still running strong. Also, C02 pistols shoot faster and harder
Usually, the only non electric rifle this is also automatic will be CO2 powered.
No. even though some spring guns have great range, co2 allows you to fire more then once before reloading.
No
No
Electric is less expensive generally, but gas is usually more "realistic"
It depends on what type of gun you are using. Refer to the manual. I would say that Green gas would be better than CO2 because it keeps your gun in better condition, but use CO2 if your gun suggests that you should use HFC 134a.
yes
No you do not need to put air in an airsoft gun. These guns are either spring powered where you must cock the gun before you shoot it, electric powered which are automatic and require batteries, or CO2 powered which requires a CO2 cartridge. This CO2 is not expensive and a pack of 40 CO2 cartridges costs only 20-25 dollars. the guns that require CO2 are not as common as the other forms of airsoft guns, although they are more powerful. In general, if you buy an airsoft gun, you do not need to put any air into it.
an Automatic Electric Gun or AEG is am airsoft gun that runs off a battery to fire bbs instead of being hand cocked or powered by a compressed gas.
Read the directions for YOUR gun. CO2 does not explode, but may leak down.
Hobby based weapons like the Airsoft Electric Gun are available for purchase at many specialty and general sites. These include Hobbytron, Amazon, and Airsoft Megastore.
Neither