This is the BULLDOG ST BETA electric airsoft gun, an outstanding PRO level AEG that has many great features not found on an airsoft rifle at this price. This AEG (electric gun) has a high-quality motor and internal parts, metal bushings, adjustable hop-up for greater accuracy, Nylon receiver to reduce the weight and deliver a custom moulded grip, high-end steel gear set. This is a Sportline ST Series airsoft gun from BULLDOG that will NOT disappoint.