This is a Crosman Air Rifle known as the Optimus chambered in 177PEL, model CO1K77X.
The Optimus break barrel is both powerful and elegant. It features a handsome" ambidextrous hardwood stock. With a relatively light cocking force and a two-stage adjustable trigger" the Optimus is built to get the job done with velocities of up to 1200 fps with alloy pellets. The barrel incorporates a micro-adjustable rear sight and fiber optic front sight. Also equipped is a CenterPoint" 4x32mm precision scope.
Features:
Micro-adjustable rear sight
Fiber optic front sight
4x32mm Precision scope