Softair Zone gives an introduction on airsoft pistols to guide beginners... "In this video we would like to introduce a range of common backup pistols. What types of drive are there such as AEP, Greengas or CO2. Gun or revolver? Here is a simple explanation for beginners in Airsoft what is GBB or NBB and what difference it makes. Why, for example, are NBB quiet and so economical and why is GBB so much fun. A shot test shows, for example, that revolvers are difficult to handle. To most old-timers, these are mostly familiar to them."