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gas operated
Gas-operation is a system of operation used to provide energy to operate locked breech, autoloading firearms. In gas-operation, a portion of high-pressure gas from the cartridge being fired is used to power a mechanism to dispose of the spent case and insert a new cartridge into the chamber. Energy from the gas is harnessed through either a port in the barrel or a trap at the muzzle. This high-pressure gas impinges on a surface such as a piston head to provide motion for unlocking of the action, extraction of the spent case, ejection, cocking of the hammer or striker, chambering of a fresh cartridge, and locking of the action.
I am looking to sell my KWA KMP9 airsoft gun. It is around 7 years old and I have not shot it in at least 5, so I am unsure on how it would perform now. There is no noticeable damage to the gun as far as I can tell. The gun also comes with 3 magazines, which all appear to be fully functional...