The Gamo Whisper Fusion Mach 1 Air Rifle features the latest in Gamo technology - the IGT MACH 1 replaces the standard spring power plant with an Inert Gas Cylinder. But the IGT MACH 1's monster 33 millimeter cylinder delivers more velocity and terminal penetration. The pneumatic cylinder rockets pellets up to 1020 feet per second in .22 caliber (with PBA Platinum Ammo). Not to mention smooth and consistent cocking efforts with constant power delivered to any pellet you fire. This high quality air rifle includes the Whisper Fusion technology developed exclusively by Gamo; this remarkably quiet air rifle includes the latest noise dampening technology that has been integrated into the steel barrel. Compared to standard air rifles, noise is reduced by up to 89.5 percent using this technology. The Whisper Fusion Mach 1 line also offers the exclusive CAT (Custom Action Trigger) which allows users to adjust 1st and 2nd stages of the trigger independently; the Recoil Reducing Rail (RRR), designed to absorb the recoil and increase the lifespan for your scope and the Shockwave Absorber (SWA) recoil pad dampens the shock giving you all day shooting comfort.