The Hatsan PileDriver Air Rifle is a genuine bullpup design, manual loading, side-lever action, pre-charged pneumatic (PCP) air rifle. Advanced Polymer, Tactical Design with Integrated Pistol Grip Unique gas piston hammer spring design Precision rifled barrel designed exclusively for heavy slugs Locking elevation adjustable cheek rest Elevation & fit angle adjustable soft rubberized butt pad Long combination optics rail accepts both 11 mm and Picatinny scope mounts 300 BAR fill pressure