Extremely easy to use; once the Crosman .177 Benjamin Discovery & High Pressure Pump Air Rifle is filled, there is no need for pumping. With a 2000 psi fill level, the Discovery can be filled by almost anyone old enough to shoot it. Dual fuel means with an inexpensive adapter compressed air can be converted to CO2 for the ability to fill the gun from a standard paintball tank offering more shots per fill. Great for hunting small game, controlling pests, and shooting targets. Hardwood butt and a rifled steel barrel.