Crosman Semi-Auto Pellet Airsource 1077 Air Rifle with Airsource Adaptor and One Air Source Cylinder Fast-firing air rifle with CO2 power and 12-shot rotary clip Rifled steel barrel and windage-adjustable fiber optic sights; all-weather synthetic stock design assures years of rugged durability Can fire 400 consecutive shots at 625-feet-per-second (FPS), using 88-gram AirSource cylinder Airsource power source; 0.177 caliber; firing velocity of up to 625 FPS; three-pound, 11-ounce weight; 36.9-inch total length This item is not for sale in some specific zip codes