The Gamo Bone Collector Maxxim incorporates Inert Gas Technology (IGT) into the powerplant by using a gas cylinder versus a conventional spring. That means you get smoother cocking and shooting, no spring torque, no spring fatigue, no issues shooting in cold weather, and a much longer life than a spring powered gun. Not only is this rifle incredibly powerful, but it has many features that set it apart from ordinary breakbarrel rifles with a typical metal spring. The IGT allows you to cock the gun and wait before you take your next shot without worrying about the metal spring weakening. Gas pistons are robust and shoot MUCH smoother, delivering less twang and vibration to the shooter!