Gamo HPA Storm IGT .22 3-9x40 Scope, Bipod (722 FPS)Gamo HPA Storm IGT . 22 3 9x40 Scope, Bipod Gamos HPA Storm is a tactical air rifle new generation adjustable polymer stock. It features Gamos IGT technology, an innovative system that replaces the traditional main spring by a last generation pneumatic cylinder, improving its terminal velocity, providing a more consistent power level, reducing cocking efforts and lessening undesired vibrations. This outstanding airgun features a CAT custom trigger