Gas Blow-back (GBB)

Powered by the addition of gas propellant from a cannister or CO2 (carbon dioxide) into the gun magazine or other gas chamber. GBB pistols are highly popular due to their very realistic blow-back action in which the top-slide (upper receiver) slides back at high speed and flies forward again to reload the next 'bullet' from the magazine. CO2 technology is becoming more advanced and is much more powerful and less resistant to the cold, which makes CO2 pistols more suitable for the UK, Europe and other countries with colder winters or climates.