An overview video of the King Arms PDW SBR Short version AEG available At Commando Airsoft in Chile... "The King Arms Short Barrel Rifle PDW series is available in different lengths of handguards constructed from high quality nylon fiber. This lightweight AEG is equipped with a 7-inch durable nylon fiber handguard.  The body was constructed from high quality nylon polymer, providing a lighter overall weight without compromising strength and durability. The gearbox is a highly calibrated 7mm bushing full metal gearbox with metal spring guide and the spring can be easily changed."