what kind of ammo ? only one type you need to try different types. are you limp wristing that can make a pistol do that with the slide.its hard to believe that all three "magazines" could be defective but it is possible tho if your limp wristing you may be hitting the mag button and not realise it. is the mag catch button tough to push in or easy to push in with a mag in place? need a little more info than youve privided.