The ATP Auto is the fully automatic version KWA Adaptive Training pistol. The ATP auto is virtually identical to the standard ATP in may ways. It has the same lightweight body and design, as well as a tactical rail built into the lower frame. The difference is that the ATP auto has a fire selector switch, allowing it to be fired in full auto or semi auto mode. The backstrap on the gun can be changed out for the shooter's preference. This gun comes with a 23 round magazine and is also compatible with extended 48 round FPG magazines. Whether you're using this gun for training, skirmishing, or target shooting, you can't go wrong with the ATP Auto.