The Gamo WildCat Whisper pellet rifle features the IGT (Intert Gas Technology) piston that allows higher velocity, less vibration and a longer lifespan than traditional spring powered airguns. The Gamo WildCat Whisper also features noise-dampening technolgy patented by Gamo. Features: up to 975 fps using Gamo PBA Platinum pellets, IGT (Inert Gas Technology) piston, Whisper noise dampening technology, single cocking break barrel, automatic.. See full description for further details