Gas powered airsoft handguns have been around for many years. They have gradually evolved from simple fixed slide pistols to advanced blow back guns capable of semi and full auto firing. The way these gas guns work is never simple. In fact, gas guns are way more complicated than their electric counterparts. There is no fixed equation on gas gun upgrade and maintenance. You will need to build up your expertise on this subject matter bit by bit. This book teaches you the basics – it tells you what is doable and what should NEVER be done so that all sorts of costly and stupid mistakes can be avoided. This book also demonstrates the kind of upgrade that is appropriate for IPSC practical shooting. The motto of IPSC is DVC (Diligentia, Vis, Celeritas), which means accuracy, power and speed.