Gamo Raptor Whisper NitroPiston 975fps .22 (5.5mm) rifle

The Raptor Whisper incorporates inert gas technology (IGT) in the powerplant by using an inert gas cylinder instead of a conventional spring. This means smoother cocking and firing, no spring torque, no spring fatigue, no cold-weather trigger issues, and a much longer lifespan than a spring provides.