Gamo Silent Stalker Whisper IGT (inert gas technology) gas spring Breakbarrel Single-shot 2-stage adjustable trigger ND52 noise dampener reduces the noise by 52%! Fiber optic front & rear sights (fully adj. rear) Tactical, all-weather stock Ambidextrous thumbhole stock Dual raised cheekpieces Rubber buttpad Manual safety Incl. PBA Platinum pellets, 3-9x40 scope & mount Here are the benefits of a gas spring: Smoother cocking Smoother shooting No spring torque No spring fatigue, even if you leave it cocked for hours Functions perfectly in cold weather Lasts longer than a metal spring