Hatsan Model 135 Vortex QE air rifle Vortex gas-piston QuietEnergy fully shrouded barrel and integrated sound moderator - approximately 50% quieter Breakbarrel Single-shot Rifled steel barrel Quattro 2-stage adjustable match trigger (adj. for trigger-pull weight, first stage, second stage & length of travel) 11mm and Weaver optics rail with scope stop Fixed red TruGlo fiber optic front sight Fully adjustable green TruGlo fiber optic rear sight Anti-beartrap mechanism Automatic safety Ambidextrous Turkish walnut Monte Carlo stock with an adjustable, raised cheekpiece Checkered pistol grip and forearm Rubber recoil pad with SAS (shock absorber system) that reduces vibration 9.90 lbs. Benefits of a Vortex gas-piston powerplant versus a coiled metal mainspring: Smoother cocking Smoother shooting No spring torque No spring fatigue, even if you leave it cocked for hours Functions perfectly in cold weather Lasts longer than a metal spring