Priced somewhere between spring and electric powered guns, gas powered Airsoft guns can be used for single shot, semi-automatic or fully automatic operation. They tend to be used by collectors due to their very authentic look and feel in use, but serious gamers will tend to use electric Airsoft guns for regular use.
The most common gas used is a mixture of polysiloxane lubricant and propane known as ‘green gas’. Less commonly used are ‘red gas’, a chlorofluorocarbon that has been banned for use in the USA and many other countries due to its ozone-depleting properties, and compressed CO2, nitrogen or air. Compressed gases need high operating pressures that can tend to cause damage to the guns due to the pressures involved, particularly damage to the bolt and slide.
Gas Powered Airsoft Guns: Pros
A major advantage of gas guns over spring guns has already been stated: they can be used for semi- and fully automatic operation, whereas spring guns are limited to single shot use. This is because the spring has to be tensioned back after each individual shot.
An electric mechanism cannot be used in many pistols due to the size constraints imposed by their design. It is just not possible to manufacture an electric Airsoft pistol that replicates the genuine guns produced by many manufacturers. Those that collect true replicas will therefore tend to choose a gas-operated pistol rather than sacrifice authenticity.
Another benefit of a gas Airsoft gun is the ‘blowback’ mechanism. This mechanism is not available on all gas guns, and costs a bit extra, but if you want the authentic feel of a gun when firing then it’s worth the extra cost. With an Airsoft gas blowback gun, the slide moves back with each shot and gives you a recoil effect – just like in a real gun.
Many people choose gas as their preferred Airsoft automatic rifle because of this degree of realism – but make sure that the clip can hold a good number of bbs or you won’t be shooting on auto for very long! You can get blowback with other forms of Airsoft power, but gas is best and most gas guns are now fitted with it.
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Gas guns offer more power and hence range than electric or spring powered Airsoft guns. Some offer a muzzle velocity of around 400 ft/sec, and this feature is best used in semi or fully automatic mode.
Gas Powered Airsoft Guns: Cons
The regulation and distribution of gas in an Airsoft gun means that gas guns are more complex mechanically than spring guns and electric guns, although are priced somewhere between the two. Some believe the simplicity of the spring guns in play make them more convenient, and when also taking cost into consideration, tend to prefer spring powered Airsoft guns to gas. Others prefer to go for electric or non-blowback gas guns for certain specialist uses such as target shooting.
There is a potential problem associated with liquefied gases such as green gas, in that the gas is very cold when in liquefied form. It can therefore cool down the mechanism of the gun in areas that are in contact with the liquid rather than its gaseous form, and this can slow down its firing rate and range. This is particularly so in automatic mode.