Sounds like the catch mechanism is broken.
The Crosman 120 is a rifle not a gun. It is a break barrel. Cock the barrel all the way down and load a pellet into the rear of the barrel. Pull the barrel back up and it' is ready to fire.
It depends on the model and the caliber of the Pellet gun.
I think you mean pellet gun. That is a gun that fires a small lead pellet but does not use gun powder. It uses compressed air or compressed gasses to push the pellet.
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Brake barrel rifles are single shot rifles. After each shot you have to fold the barrel down (Break the barrel) in order to cock it again.
A pellet gun is not adequate for protection, and will get you arrested.
It all depends on the model and who made the pellet gun. I suggest that you re-post the queston with the model and make of the pellet gun to get an answer.
Any pellet gun should be handled like a real firearm. Yes you can be killed with a pellet gun under the right circumstances.
No. Even if it would fit in the chamber, there is no firing pin on a pellet gun.
Nope. Pellet guns are fairly safe to use.
No. A pellet gun would use compressed air.
Is this a Pellet, BB or airgun? If it's a pellet or BB gun you can use a .177 cleaning rod down the barrel to push the Pellet back out of the barrel into the breech. Make sure the pistol is not cocked. I suggest you look up "air gun repair" on the web and take it to someone who repairs airguns to have it fixed.