Gas Blow Back. Weapons of this construction the most perfectly copy function of real arms and shooting feeling is really perfect. During firing with this system moves slide and make a sensible kickback.

This construction is used for airsoft gas pistols, but also some machine guns and assault rifles. The necessary feature is the use of a propellant gas - type GreenGas, HFC 134/144a or CO2. This is easily filled from the external bottle to the reservoir, or in the case of weapons CO2 used single replaceable cartridge. Guns are not generally suitable for colder weather.

Guns type GBB require regular and careful maintenance, cleaning and lubrication.

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