Despite its low price, the 1077 air rifle from Crosman is incredibly reliable, and with a semi-automatic action that fires as fast as you can pull the trigger, it will provide hours and hours of fun.
This rifle has a fully adjustable rear sight, a fibre-optic front sight, and a 12-shot magazine.
Power is Approx 5.0 ft/lbs. Ideal for plinking and general target shooting.
fires 12 shots as fast as you can pull the trigger. 
Power source is the small 12g co2 capsules. 
Specification
Calibre : .177 (4.5 mm)
Weight (oz) : 3lbs 11oz
Length (in) : 36.88in
Barrel : Rifled
Front Sight : CenterPointTM fibre optic sight
Rear Sight : Adjustable for windage and elevation
Safety : Cross Bolt