This pistol shoots up to 400 fps using .177 caliber PBA Platinum Pellets. Unlike most air pistols, the P-900 features a break barrel action instead of being CO2 powered. It uses Inert Gas Technology (IGT), a gas piston that provides steady and consistent power, which improves accuracy and durability while reducing vibration.Features :Windage Adjustable Rear SightFiber Optic Front SightBreak BarrelRifled Steel BarrelManual Safety MechanismTextured Rubberized Ambidextrous Grip