GAMO Silent Stalker offers all-weather durability combined with maximum performance. Light weight synthetic stock, match grade fluted barrel, and 1300 fps with PBA make the Silent Stalker Whisper perfect for small game hunting, targets, and pest control. The IGT (Inert Gas Technology) is a new advanced technology from Gamo for Adult Break-Barrel Air Rifles. This innovative technology allows shooting pellet ammunition by use of a pneumatic inert gas cylinder instead of conventional spring technology. Pellets not included.