Green gas operated airsoft guns are by far the most realistic platform currently in the airsoft market. For the airsoft gun to shoot properly, the user must manipulate it like a real firearm. Because of how realistic the system is, some law enforcement and military agencies will purchase these airsoft rifles and use them as training tools.
How a gas blowback airsoft gun works is the gun has a gas reservoir that stores pressurized gas (similar to propane gas) known as top gas/ green gas. Whenever the user pulls the trigger, there will be a knocker that will hit the valve on the gas reservoir, causing it to release a small amount of pressurized gas into the GBB platform; that amount of gas will first push the BB out of the chamber to cause it to fire, and the remaining amount of gas will cause either the pistol's slide or the rifle's bolt to move back so the airsoft gun can load the second round for a follow-up shot.
As realistic as the GBB platform is because it uses pressurized gas as the power source, the airsoft gun is quite prone to cold weather, and when shot too fast, a cool-down effect might occur resulting in a significant fps drop.
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