Whisper Fusion noise reduction technology uses a double integrated sound moderator to compress and prevent noise expansion. IGT Mach 1 technology uses an Inert Gas Cylinder to deliver more velocity with less vibration and smoother cocking. Custom Action Trigger is adjustable for 1st and 2nd stages. Recoil Reducing Rail extends scope life. Available in .177 cal. (1420 FPS). Includes 3-9x40 scope. Mass Weight: 6.61 lbs.