Gamo Silent Stalker IGT (inert gas technology) gas spring Breakbarrel Single-shot 2-stage adjustable trigger All-weather ambidextrous stock Dual raised cheekpieces Fluted polymer barrel jacket Rubber buttpad Manual safety Incl. PBA Platinum pellets, 4x32 scope & mount (no open sights) 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