no
expense of cartridges is the con.
No, Co2 airsoft guns run off disposable 12 gram cartridges, whereas green gas guns have internal storage and are refilled by propane tanks. Actually there are now dual use guns and adapters to use CO2 to fill green gas guns .
it depends on their velocity. all three of them can have guns that hurt.
No. The base of the guns are different and it is impossible to change it into a quality CO2.
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.
No. even though some spring guns have great range, co2 allows you to fire more then once before reloading.
Airsplat.com is the place where I learned about airsoft guns and how they work. Their Customer Service is friendly and will answer any questions you have about Airsoft guns. First of all there are 3 different Airsoft guns; SPRING, GAS, and ELECTRIC. Spring guns are manually functioned meaning you have to manually retract the cocking mechanism to shoot one BB at a time. Gas guns are typically filled with CO2 cartridges or Green Gas which is a mixture of 100% Silicon and Propane which both the CO2 cartridge and the Green Gas are loaded into the magazine. The Electric working airsoft guns are powered by batteries and electronic components that are upgradable can enhance the performance of the guns rate of fire and durability.
Most are electric, but many run on Co2 or manually cocking a spring.
No. Most airsoft guns that run off of CO2 use unthreaded, disposable 12 gram cartridges.
There might be a slight chance that you can use a Cycling wheel co2 chamber at your local sports shop
Green gas is required for Gas airsoft guns to work. Usually when you purchase airsoft guns, it will state whether or not the gun is a Spring loaded, CO2 Gas, Green Gas, Or Electric (AEG) Rifle. Best place to go for airsoft guns is Airsplat.com. That's where I go for all my purchases and I've had nothing but great experiences there with reliable products.