From this point, the gas is divided to propel the BB and blow the slide back. Although the power and strength of the recoil depends on the type of gas used, the force of the recoil is usually compared to that of a .25 caliber handgun. So, the recoil isn't tremendous, but is enough to make shooting fun and realistic. The world of GBBs can be very confusing to someone new to the sport of airsoft. There are many gasses, different manufacturers, and much to know about general maintenance, all of which I hope to explain later in this guide.
Gas is the source of power behind gas blowback weapons.
Although there are many gasses of different compositions, the two most popular gasses are Japanese HFC134a and Taiwanese green gas. Japanese gas or HFC134a is the lowest powered gas and is meant for use in Japanese GBBs. HFC134a is also chemically the same as 1,1,1,2 Tetrafluoroethane or duster gas. Duster gas, also known as PC duster, or keyboard cleaner can be found at almost any electronic store or office supply store. Certain adapters must be made to transfer the gas from the duster can to the magazine.