Benjamin .177 Cal powered by a Nitro Piston Technology that provides a quieter shot, reduced recoil and greater velocity/energy consistency. These Magnum Series rifles are developed to deliver increased power with exceptional energy levels. They generate 25fpe with pellet velocity up to 1100fps (lead-free pellet). Key Benefits of Nitro Piston Technology (versus spring powered break barrels) The gas piston uses compressed nitrogen as the power source Is not adversely affected by temperature Reduced Recoil (spring torque) Higher velocity and muzzle energy capabilities Can remain cocked w/o weakening the power source(no spring fatigue)