He left it cocked and the spring is compressed and loaded...

Keep the muzzle pointed in a safe direction. It's loaded and ready to fire. remove the screws on the bottom and take the reciver and barrel out of the stock. Disassemble the anti-beartrap mechanism by removing the pins. Take a screwdriver and rap it on the mechanism under the cocking lever on the receiver. The gun will fire. This will happen every time you cock it twice. Always assume the fast deer is loaded (like any gun) and fire safely before cocking. It should not be stored compressed. That will shorten the spring life. Good luck and be safe! Watch your hands and fingers. My Norinco KL-3B fires 638 fps with Crosman Premier 7.9 grain domes. Ric