A few weeks ago, I picked up a .22 Magnum AMT Automag II at a gunshow, and the thing cant cycle once, I load it and lock it correctly, and after the first shot the slide will come back,lay down the hammer, and go back into firing position,but the when I pull the trigger again,nothing happens, its like its on safe,but its not, I pull the clip and pull the slide back, and the primer is not dented in the chambered round.does anyone know what the problem could be?